When do you first kiss her?

Kiss her only if you think she likes you back and would accept the kiss. Being that it will be your first kiss with her, do it somewhere private, so if she welcomes it, it will be more special. However, if she doesn't accept it, nobody else will see if you get rejected. Don't let it be a huge surprise to her though; the key is timing. If it feels like it is right then it probably is but if not, then wait. Don't drown her in your kiss or go overboard - it is the first kiss. Eiither let her deepen it or wait for a more intimate kiss when the time is appropriate.