1) Start raiding ASAP. Yes it may suck for your buddies, but you wont reach BT in the time we have left without being able to recruit for a month. And I am sure the recruitment of raids will be a waste of time until you start raiding. Your buddies can get geared up easily enough outside of raids or in a couple of T4 farm runs. You have at MOST 4 months if WoTLK comes out when it's said to. You can't waste 1/4 of your time waiting.
2) I would start asking your buddies what their vision of what the guild is to become. If it isn't what you envision, inform them of YOUR goal. If they don't like or aren't willing to help you reach said goal, tell them politely that you need officers who share your vision, and demote them to some kind of Veteran rank.
3) If you burn a hole in Kara, waste Gruul, shank Mag, ignore Hydross, (resist sets suck and take a long time to create, plus Hydross drops shit loot), and skip Vashj, ignore Kael, probably skip Al'ar, start MH/BT then yes, you could potentially get a decent way into BT before wrath.