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New guy here, just scored a great deal on some space wolves in a trade and got the following:

10 grey hunters
10 blood claws
Wolf priest
Wolf Lord
2 rocket launcher marines
Rhino
2 unboxed long fang kits
Codex

Pretty good start (considering it helped me clear out the lizardmen models I owned)
So the question is how do I build those long fangs..

As mentioned, I already have 2 missile launchers, maybe another two and 2 Lascannons? What other weapon combos are solid choices,

Missile launchers aren't really great these days. Back in the last book they were stupid cheap so you always took 5 of them, but they had a significant price hike in the new book.

My personal preference is a couple of plasma cannons since they're cheap, then either a few normal guys to soak up wounds, or take 3 heavy bolter guys because they're also cheap and will generally lower the perceived threat of the plasma cannons (until you remind your opponent that they split fire).

Plasma + HB also has good anti infantry synergy since they're the same range if you want to really lace into 1 unit with them.

Also, consider taking a Terminator as the unit leader. It's a cheaper upgrade than putting a Terminator in any of the other squads. His 2+ save will really help deal with incoming fire, and you can throw a storm shield on him for free to soak up the odd AP1-2 shot that will come his way once he bounces off a bunch of small arms fire.

Lascannons are generally the most useful and reliable of the options. Good range, good vehicle damage, decent price. Plasma Cannons are higher risk but quite good against high armor threats. Both are good at hurting MCs, can take down vehicles, and bypass the armor of infantry.

Heavy bolters are meh, multi meltas need a relentless platform to be of any real use, and missile launchers don't pack the power of a lascannon (that +1 str is HUGE vs AV13/14) and lacks the AP of lascannons and plasma cannons which lets 2+ armor models just shrug off the krak missile wound 5 out of 6 times. Frag missiles are a joke as well so they really only have the Krak Missile to at their disposal.

Longfangs plays differently than normal Devastators because of two unique rules it has:

1.) The unit has split-fire as long as the pack leader is alive (I think) and

2.) All models must be equipped with a heavy weapon or (in the case of the pack leader) special weapon. And you're limited to a maximum of 6 models (7 if you add in a wolf guard).

What this means is that your longfang units are much more fragile than other similar heavy weapon squads, as there's no way to get ablative wounds in there. On the other hand, you can take two types of weapons per squad and, due to split fire, reliably use them without much fear of "wasting" shots. This makes them more akin to the CSM Obliterators in use, in that while an individual squad might not pack a lot of punch, it can bring far more versatility to the field.

In terms of heavy weapons, The Plasma Cannon, Lascannon and Missile Launcher are the most worth looking at:

The Plasma Cannon is effective in clearing out heavy infantry and high-toughness models but don't count on it hitting more than 2 models per shot, since the template is small and people tend to not clump their models too tightly together. However unless the model hit by it has a cover save, you can pretty much bet they'll be toast. Plasma cannons can also be used against light vehicles, as their S7 AP2 will be very effective in destroying light vehicles. Plasma Cannons are also one of the cheapest choices out of the three (or at least tied with the ML) so it's also points-efficient.

The Lascannon is the best in anti-tank defense but can be lacking when you're facing down against horde armies or even just decently sized squads (even a squad of 10 can be a problem for lascannons, as you get at most 6 shots, 2 of those shots will miss and probably half of them will be saved by a cover save). Since the lascannon is the most expensive option, only consider it if you are expecting to face heavy tank armor (such as AV13 Cron, Land Raiders or Leman Russ Armored Companies).

The Missile Launcher is still one of my favs because, while not as cheap as before, is still fairly cheap for a S8 shot, which is effective against AV12 and lower armor (the vast majority of vehicles are still AV12). The S8 and AP3 means that most marines using FnP wil lbe terrified of it and against hordes you can reliably spam those small templates to rack up the wounds. Just note that the Missile Launcher is the midground between the plasma cannon and the Lascannon; it's horribly ineffective against their dedicated targets, but gives you the option to effectively engage all targets. This is doubly so for Longfangs, who can either use their splitfire to target a light vehicle with the Krak Missile then have other members switch to Frag for an oncoming horde, or go full on Krak to take down a particularly "it needs to die" vehicle (something that neither the plasma cannon or lascannon can do).

EDIT: Vankraken pointed out a rule fumble in one of my examples so I changed it.

EDIT 2: changed another rule fumble.

 MechaEmperor7000 wrote:
This is doubly so for Longfangs, who can either use their splitfire to target a transport with the Krak Missile then have other members switch to Frag for the occupants, or go full on Krak to take down a particularly "it needs to die" vehicle (something that neither the plasma cannon or lascannon can do).

You can't shoot a transport, destroy it, then have the rest of the same unit split fire at the passangers. Split Fire rule specifically states that restriction.

 Vankraken wrote:

 MechaEmperor7000 wrote:
This is doubly so for Longfangs, who can either use their splitfire to target a transport with the Krak Missile then have other members switch to Frag for the occupants, or go full on Krak to take down a particularly "it needs to die" vehicle (something that neither the plasma cannon or lascannon can do).

You can't shoot a transport, destroy it, then have the rest of the same unit split fire at the passangers. Split Fire rule specifically states that restriction.

Sorry about that. I meant something along the lines of "Have half the squad shoot a light vehicle and the other half shoot at hordes".

I have been using a Long Fang Pack with 2 Las-Cannons, 2 Missile Launchers and a Heavy Bolter for a few years now [since the 5th edition Codex] and have great luck with them.
The Missile Launchers and Las-Cannons are great for medium armor threats and most MCs while the Heavy Bolter can be used to deal with little things like infantry and light trasports, especially when mixed with a Divination Rune Priest.

 MechaEmperor7000 wrote:
Plasma cannons can also be used against light vehicles, as they will tend to hit the weaker side armor most of the time (or even the vulnerable rear if you're lucky)

That's not how blast weapons work - only barrage weapons. Blast weapons resolve against the facing that the firing model is in.