H-1B Stamping with F-2B application pending

I am under 1 year OPT now and my OPT expired December this year. Now I am applying H-1 and got approved. I want to go back to my country for two weeks (vacation) on October. 1. Do I need to go to US Consulate for visa stamping? 2. I also had green card application under F-2B (family based for unmarried child over 21-my dad sponsor). What is my chance for H-1 interview? If I fail, can I go back to US? 3. If I stay in US and keep working, do I need visa stamping? Thank you very much.