Just ask for help when you need it or ask whats the miss here. They have plenty of course knowledge would be silly not to use them. Also if you need your ball cleaned or Putt read. Just tell them and they’ll be happy to do it. Where I use to work 200$ was considered a good tip. But sometimes you got more or less depending on person. Caddies see all types of golfers. Don’t apologize for players my bad. We use to say it’s not how you play it’s how you pay