Haha you definately picked the perfect time to look into this. This week only they are running a 50% off entire armies sale as a massive push for promoting the game. Check out this thread:
http://www.dakkadakka.com/dakkaforum/posts/list/354766.page
To answer your questions:
- Terrain can be anything from a LOT of
GW style terrain to simple paper terrain. The system does work great with more terrain the better, but don't let it intimidate you. Simple box terrain, flat wall works great and it sometimes even preferred to complex terrain. If you even did paper/plastically wall terrain to simulate an indoors battle it would work superbly.
- All you have to by is like 1-5
D20s (50 cents around here), and at least 100 pts worth of models. The starters in the link about get you knee deep in the game with a mind blowing 250-300 pts for like 60 bucks.
- The game is incredibly balance, very very few rules loopholes/errors, and it can be as simple as duct in and out of cover exchanging gunfire to having ninjas decloaking behind you with a shotgun. Besat of War did a watered down packet of the rules to make things easier for new players... which I also linked in the thread above. When you are new start out at like 100-150 pt games, when you get to the 250-300 it starts to have nots of rules and lots of
AROs if you aren't hiding well.