Bro part of growing up is learning through trial and error. Try one amount. If you can’t trust yourself to remember the result, write it down. Then repeat with a different amount.

You can ask around for recipes but if your question is how much sauce per pasta (I’m fudging the definition of sauce here), there isn’t one standard.

I personally add just salt and pepper to mac n cheese and call it good, but I’m in my thirties. I experimented mostly with eggs in my teens.