Pre is fine. Raise flop bigger. Do some research on bet sizing. Never fold a set in fear of a better set (deja vu).
You're gonna find out that there is way more to learn here than you ever thought possible. Unless you have a really solid bankroll I suggest you move down to 2nl for now where it's cheaper/easier to learn. Grind out 20k hands there and evaluate you're play/winrate.