I dont get what a FS tranny hook up would be.. BJ/Anal?

Yep.
Most will let you blow them.
A few will even give it to you from behind.
If that's what your into.

Depending on the girl it could be BJ/anal but it could also mean you will get ripped off. Check the reviews since whats written in majority of ads is just lies.
8-9" fully functional is a common ad phrase which in reality is 4" and a limp noodle.