Just a heads up, I would skip the CG for making money. Open play will be swimming with people in end game ships looking for free kills, and it's probably paying poorly anyways. Look up how to do Exobiology, or trading with the Pilot's Trade Network's carriers
(link they have a handy subreddit that's helpful for this) is a great way for trading cash. r/EliteMiners is how to learn to mine the best, the pinned comment
linked The Current State of Mining is where it's at. If someone argues with that post just ignore them when it comes to mining. Or if you have the chops you can do AX CZs over planets and even with beginner gear make great money.