Pls help idk how to talk to a guy lmao

So I have been talking to this guy I’ve liked for a while now over text and we go to the same school and we have the same lunch and one day I asked if he wanted to have lunch he said yes and for the entire lunch period we probably exchanged like 4 words to each other. And I also think he likes me too so that doesn’t help lmao. And I also recently asked him if he wanted to hang out but if he says yes I don’t know what the fuck I’ll say cause we both get very flustered when we literally look at each other. Also I’m 16 and he’s about to be 17 don’t know if that helps.