If you want to raid you may also want to consider just leveling one toon to 80 tomorrow and joining the raid, unless you are pretty experienced with naxx (I assume thats the raid; voa and Obsidium Sanctum can each be done in 15-20 mins) you will want to take one character in first just to learn all the encounters. In 25 man you can definitely multibox most if not all of them, but it will involve a lot of wiping if you don't know every fight from a technical perspective first.