I have a few questions and I was wondering if I could get any answers here, since I didn't know where else to post this.

I recently got to know this girl, and we were friends for quite awhile. It's clear that she has something for me, cause she's been throwing hints at me for 'it'. Now I dont have a problem about giving it to her, but the thing is, she's not really pure. She had a relationship with a guy before and she was abit of a lesbian. My question is :

1) If I had sex with her, will I get any weird diseases(syphillis, herpes, etc) from her, assuming if her previous partners are clean?

2) Is oral and intercourse still safe at this point, condom or no?

3) What're the chances of me getting HIV or AIDS from her?

Sorry if I sound like a wuss, but its my first time so I'm kinda worried and stuff.