Briefly ...
1) Yes ... you'll need either CPL(H) or ATPL(H) theory as well.
2) If you're not going to get an IR, then CPL(H) theory will suffice. Check out CAPT run by Phil Croucher. It's helicopter specific which Bristol isn't.
3) Only people with more money than sense would do their flying training in a turbine. You'll find the type rating for the turbine very straightfoward so leave it until you need it; otherwise the upkeep of the rating could be expensive if you're out of work. Without wishing to start the R22 v S300 never-ending-debate (and I'm rated on both), I think with your experience, you'd prefer the Schweizer.
Cheers
Whirls