The Indy lightsaber school is an established school, and they will start you off with Form I (Shii-Cho), which is a 2 handed fighting style. From there you will progress, after a certain amount of time and skill development to Form II (Makashi), which is a one handed style reminiscent of fencing.
This is where I differ quite a bit from many of the forum members, I do not like using 2 hands on Initiate and Apprentice sabers, but I'm also on the larger side with large hands, and I just run out of room. Others use two hands just fine on those.
I'm not on the larger size and I agree with Landen on the Initates and Apprentice being on the short side for two hands (it can certainly be done, I'm just not comfortable with it). On the other hand, the hilt closest to my ideal length is the Arbiter, so....
My recomendations are the Dominx v3 or Sentinel v4, in that order. Both are excellent hilts, and you really cannot go wrong with either one. I find the Dominix v3 to be a bit more comfortable than the Sentinel, mostly due to the slanted choke points, but both are really good.
For sparring, and general practice, I recommend a Heavy Grade blade. It can take any punishment you give it, and the weight gives the saber good balance. I only buy Heavy Grade blades, but I tend to hit things rather hard too (sometimes even intentionally). Ultra Edge or Standard is personal choice, I prefer standard. Blade length is also personal choice, I greatly prefer 36" blades on sabers (which is funny, since I usually prefer 28-30" blades on swords).
Combat style, start with Form I (Shii Cho) and work your way through the progression. You'll quickly find what you're most comfortable with.