Serious question ?

ok, so ive been dating my girlfriend about 5 months so far. we are both 20 years old, and she never had , and claims she never even masturbated before...she is very ignorant about the subject (shes from Ukraine...not USA)...how should i start talking about with her? i dont want to force anything but i got a huge ual appetite! i love this girl and just want it to work out