first dont be afraid to ask the guy you pick wat he likes
a good guide is if you have had a good blow job what did
you like about it

here is the best how to site i know its a gay site
but the ladys may want to take alook too
http://www.jetlagdesign.com/sexguide/

anal i got some sex toys dildos start small and
go up in sizes when comfterbul remember
lube use a water based one beter for the dildo
and wont destroy condoms
relax take your time comunicate with him

check out the web site above its very good
enjoy your self if you enjoy giving head you
will soon get good at it
lol from a fellow bi guy