Anal sex do's and don'ts?

Howdy y'all, So I finally have a question instead of an answer. Anyways, this summer my boyfriend and I decided that we wanted to have sex for the first time. This would be perfectly great if I wasn't such a vigrin to every sexual activity known to man. So, my position in this relationship is a "proud power bottom". That statement would be true if I actually knew what to do… Finally, my question is what are things I should and should not do during sex, also what are some things I could say? (Please awnser this question as professional and as less vulgarity as possible. Multiple answer would be very helpful). Thank you guys :)