Walls and Ceilings - lvl beam to replace load bearing wall

I am wanting to remove a load bearing wall with a "stick built" roof above. Would like to not have the beam below the ceiling and no posts supporting the beam. Here is some more info:

Beam (room)length = 33 ft
Room width = 27 ft (13.5 ft on each side of beam)
IBC2000 codes 20lb snow load 100 mph wind - South carolina

1. What size lvl beam would I need?
2. Can I put this inside the attic and attach the current ceiling joist from below? If so, How do I attach them from below. They are currently resting on top of the wall with a 2 inch overlap on each side.
3. If I can't clearspan this distance, what is the least number of posts I could get by with?
4. If LVL won't work any other suggestions? LVL is the lightest from what I have seen.
5. Any recommendations on who to contact for this info?

Thanks
Kyle

You need to hire a structural engineer to do this correctly.