1) given my situation, what are the transmission rates to negative female partner?
In a longer term relationship, the risk of transmission of HSV 2 is about 10% per year doing nothing.
2) does it makes sense for me to take valtrex daily? And is it well tolerated for long term usage (e.g. 10 years +).
Yes, and it reduces transmission by 48%. Condoms reduce transmission by 96$
3) how can I safely impregnate a future partner? I assume I will need to be on anti-virals but no condom? Or do I need to think about IVF?
This is a decision that the two of you should make. Turkey basters and a jar of semen at home would work also!