ok, lets talk about set up in a home theater

this is my speakers and room and gear.
pioneer 92txh elite
b&w 804s fronts
b&w htm4s center
b&w cdm 1 rears
old cerwin Vegas 15" powered sub
room is 25' by 25'... half is home theater
no room treatments...concrete block.... commercial carpet...
fonts are bi amped. audio quest wire.

with my receiver i have pre outs for separate amps

do i use the room setup speaker from pioneer?
do i just plug in my frequency for the speakers? (on my receiver)
set the front speakers to small or large?
set my sub for the lower frequency of my front speakers?
thoughts?