Need advice

Ok all, in the past I was in a mentally abusive and very toxic relationship. And that was a few years ago. Recently I have started liking this guy at school (I am a senior in high school) and I believe he likes me back, the flirting is just crazy between him and I. But I’m nervous because it has been awhile since I have been in a relationships and my last relationship was so toxic and I don’t know what to do or anything. If that makes sense, does anyone have advice?