You need to know what her limits are. It varies with everyone, I was pretty much a practising Muslim, and then I met the guy of my dreams and relion-wise, things went a bit iffy. I've gone all the way with him (sex etc.) which is completely against the religion. there are things like how he can't meet my family because they'd kick me out/shun me etc... Once you get closer with her, ask her what sort of things she practises. Some girls won't want a physical relationship at all, for others they're ok to kiss but nothing more, soem girls will be fine with foreplay but no penetration etc etc. And then there's things like how she might not eat certain food, might not drink. Tbh, things like drinking and eating non-halal is completely forbidden but you need to know what her own personal choices are since in western societies these tend to differ person to person. And good luck with it. Also, just a friendly tip (an not patronising, just saying cos I'm a 'muslim' girl) do try and be very considerate towards this because for her to even contemplate having a boyfriend is a big step, so bear in mind you probably mean a lot to her if she's willing to risk getting into a **** tonne of trouble for you.