Rune Stonegrinder wrote:What is the equipmment on your models, lets start there. Knowing a little more about what you have may allow marine players to help you little more.
Depending on your play style there might be may suggestions marine lovers can give you.
He said he’s working from the
DV box, so his options should be plasma, plasma, more plasma, and finished with some overpriced plasma.

Assuming he hasn’t modified stuff.
Terminators are AsC, 1xChainfist. Which, coincidentally, is how I field my tactical terminators when they hit the table. Not hyper-competitive, but a good all around build for casual play.
Captain should probably be fielded a artificer armor, relic blade. Not the strongest load for him, but inexpensive and should get the job done.
Librarian is force sword/bolt pistol. Good
HQ for keeping points down, can upgrade to level 2 in larger games.
Bikes can take advantage of more special weapons then the one plasma gun this squad comes with. While grav gun have overshadowed plasma guns on bikes, the old faithful can still blow holes in things. Getting a second set of the
DV bikers would not be a bad call. Run the squad as a 5 man, duel plasma squad and modify the extra sarge into a captain/chapter master on a bike.
Plasma cannon/plasmagun is an OK load for a
tac squad. Plasma pistols are massively overpriced, especially on sergeants.
And while I’m here rambling, some more generic advice for the
OP.
Magnets. They are your friend. You don’t need them everywhere, but they can help stretch you hobby dollar by allowing you to mix things up. Starting early is better then retrofitting later.
The sternguard and vanguard kits are packed full of all sorts of extra bits. Picking these up will let you build all sorts of cool looking minis. If you want to build a WYSWYG army, you will find pretty much every option in one of these two kits. The sternguard kit is the better of the two, but I’m fond of both. The kit is so full of extras you can add 5 tactical marines worth of parts and end up with a full 10 man sternguard squad that is still distinctly more ornate then your average trooper.