Coming in a bit late here - glad you enjoyed it.
Folks have told you all the key bits, and really it's a doddle. Reds Blues Greens is the important one.
I find with ours that the auto gear extend means the wheels won't retract till airspeed gets to about 90 knots, and of course with the wheels down that takes a while. So I always use the "auto extend override" on takeoff - pull up the little red button and push in the pin to hold it up. Once you're up to cruising height and speed, and over land, release it again just in case.
I leave it locked "up" over water - years ago, we lost an Arrer cos the engine went BANG! over the Solent, the gear dropped automatically, and P1 (not me) was a bit too preoccupied to realise why he wasn't getting the glide he should. He splashed down about 50 yards offshore. Wheels up till later, he'd have made it to land.