1. There is a thread in this forum that answers the question about shy guys. Those more aggresive ones would try to initiate kino as soon as possible and ask the girl out on a date, kiss close at the first date etc.

2. No such thing as definite signs other than him proposing. In fact, that isn't even definite lol

3. Why not? I agree with Mark. But be careful not to come off as some sort of slut/whore or something.