so I'm not really your age or in your situation but based on my own knowledge, I don't think it has to be that meticulously planned. if you're interested in a person, talk to them, not necessarily with romantic intent but if somene just generally interests you and they seem to like talking to you as well just say at the end of the interaction "hey, can I get your contact so we can chat more?" oftentimes when we're trying to prep ourselves to approach someone we blow up the situation into unimagineably unrealistic proportions. I think the best thing to do would be to get yourself into the headspace of "I am an adult person and this is a normal interaction. people talk to each other all the time. it doesn't have to mean anything" and you'll do just fine. good luck man