WANT STAY IN US BEFORE 485 FILE

THANKS EVERY ONE, GC HOLDER 3 YRS, GIRLFRIEND IN CHINA. AFTER GET MARRIED.
1. CAN SHE VISIT HIM  IN US?
2. WHAT KIND OF VISA? VALID? RENEW IN US?
3. HOW LONG CAN FILE I-130 FOR HER?
4. HOW LONG NEED WAIT FOR F2A I-485 FILE?