1. For a DA Bike Squad, when the codex says I can have two bikers pick additional weapons, is this for the 3 man squad or the 6 man combat squad?
It just says 2 may take, no restriction on number of models required
2. When deploying combat squads, let's say I broke up a unit of 10 tactical marines, could I still move them together a a 10man blob and simply split them up once I reach an objective or are they limited in how close they can be with one another?
Yes, Though you would have to roll difficult terrain separately, and you would want it to be clear which squad is which for wound allocation. For all rules purposes though they would be 2 separate squads.
3. I like Sammael's Sableclaw and am most likely going to head that direction with him and use him as more of a support with a bunch of other land speeders for my RW group. Are there any benefits to using Corvax though, besides being more of an offensive type of unit?
He can assault(and being assaulted isn't pretty much a guaranteed death), he has 1 more wound than the speeder, he is eternal warrior, he can over watch... I'm sure there are more reasons.
4. With 7th ed coming out manana, my play group are barely learning 6th ed and will probably not switch to 7th for at least 6 months or so, but if I wanted to use the Psyker Cards/Phase as well as the new objective cards, would this be something we can simply add to a 6th ed game, also, anyone know if those cards come with rules or are the rules for them in the BRB of 7th ed?
Since its a house rule you should discuss this with your group, it can work but you would have to make it a house rule.
5. Can I buy attack bikes and land speeders separately from GW? Looked on their site and not seeing anything but I would like a few more of the two that came in the RW Battleforce but I don't exactly need all those bikes right now?
Yes, they under normal space marines, if your expanding the battle force is a much better deal(unless you truly don't need the bikes at all) $110 for the battle force $140 for the items in it separately
Link to them on the US store:
http://www.games-workshop.com/en-US/Warhammer-40-000?N=102352+4294967184+4294966940&Nu=product.repositoryId&qty=12&sorting=phl&view=table
6. Librarians on bikes. How does this work exactly? Are there librarian models that come on bikes or am I simply customizing one myself? Also, would the Librarian on a bike be a viable unit for a squad of bikers or would he need to be with something else, the codex for the bike squad doesn't list Librarian as an option?
He would have to be made as they don't make a model, same for chaplains, he can work very nice depending on what you take for him
6a. I noticed in the RW Battleforce that the RW Sergeant comes with a hood and robe, would any problems arise with me calling him a Librarian and throwing him in a squad?
as long as its clear what he is, no
6b. When adding the additional weps to a bike squad or to units as a whole, if I don't own the bits for that particular weapon, am I allowed to use those weps? For example, I have Belial and he comes with a sword and gun, if I wanted to switch to two claws or his shield combo, would I have to go out and buy the bits or can I simply say, "his codex lets me use this so he is using these instead even though it looks like something else?"
You have to find out if people in your area care, if they are big into
wysiwyg then yes you would want to model them with it, if not you just need to make sure its clear who has them.
7. Banners. Do I need a special unit to hold a banner or can any unit hold one? I ask because I was given a SM Captain from ABR and he seems to be equipped with a banner on his back, if it is a banner can I simply call him a banner bearer and use the banner as whichever I wanted? Same goes with Azrael. Dude has a giant banner on his back, can I equip him with a DA banner or are there specific people for that??
You need certain units who are allowed to take the banner, for Dark Angels
iirc that would be yor 3 types of command squad.