ok. if you´re absolutely sure that you are ready to do it, and make sure, then there are two ways it can go.
you can either, one, set him aside when you two are alone and be an adult about it. tell him clearly that you are ready to be more intimate with him, and ask him how he feels about it.
or, you can wait until you guys are alone and having a romantic moment and take lead. during some make out session or what not just go with the flow, and let him... well you know.
ahhh but in both cases make sure there is clear communication between the both of you, sex is something very important and has to be handled like an adult. which shouldnt be too hard if you really are ready.
good luck
and remember use protection