1. Same typical routine as other posters.
2. I have grappled with girls on only a couple of occasions and yes it was slightly akward to get triangled and "owned" by a girl, lol.
3. If you wear a Gi it typically soaks up most of the sweat.
4. Being a typical young male and having hard ons pop up at the slightest breeze I was slightly worried about this one to before I started. But now nothing gives me a bigger softy than some dude trying to choke me out.
5. Youll get used to it for sure. Your mind will be focused on improving your position, submission defense, ect.
P.S. As cmfisher said rolling will be hell for a few months and you will likely get owned by nearly everyone but stick with it.