There's a cute person at the deli counter in the grocery store that I go to that gets really flustered whenever we interact. I catch them sneaking glances at me when we're not directly interacting so I think they think I'm cute, too. I think they're adorable and would like to ask them out but I've literally never done that before and have no idea how to go about it without seeming weird. I'm also ND and very socially awkward, please help 
Other posters are giving good advice. Keep it simple. "We should hang out" is a good line. When you start to feel those butterflies just really focus on them and tell yourself they are a good thing. When you learn to like that feeling you'll be unstoppable. Good luck.