Okay /adv/

The girl I'm flirting with/starting a relationship with is really really inexperienced. I'm not that experienced too (I've had 4 gfs and several ONS).
I know the basics obviously, I know that girls are different but I've always had more experienced girls with me. I've had girl who liked very rough sex, other not that much. Several all about clitoridal stimultion, other not giving a shit about it.

Now this one had like one bf and sex wasn't good at all for her apparently. She's kind of freaked out about it.
How can I tackle this issue the best way possible?

I was thinking about starting slow, tons of foreplay, being romantic and such to get her relaxed and in the mood.
Then maybe go a little rougher progressively.

Would this be a correct course of action?
Should I not overthink it and just do whatever and try to communicate with her?

I'm not sure she understands her own body (she confessed she's not really masturbating often because it's too much of a struggle/too long). Any pointers I should follow?

Thanks in advance for your help