Buy a good target. I went to my supply store and picked up a xbow target that damaged my fletchings and needed the arrows to be pushed out from the back side, got myself a spyderweb a few days ago and the arrows are happier and so am I.
Don't be afraid to shoot it either. Ravins are designed well enough that arrows have to be nocked and safety off before it'll fire, I've pulled the trigger a few times without an arrow in my 29x and safety off and the bow didn't blow up, cant say that about every xbow. Just make sure your arrows are good and theres not a lot to mess up or do differently. You need experience to learn and you don't need to know much to start getting experience. Someone already said read the manual, gives you what you need to get started.
Decocking it's more important to just hang onto the handle and keep the lever in the back down, human arms don't move in circles like that naturally so as long as your hand is gripping the handle and the xbow is stable nothing short of the crank breaking will cause trouble. I cocked and decocked my bow probably 2 dozen times before launching an arrow with it, totally unnecessary but it made me feel better.
Also avoid making the handle slip when cocking it. I got in the bad habit of cranking mine until it slips which may cause it to slip more easily in cold weather.
I recently ordered some limb dampeners, didn't initially buy them because I wasn't convinced that a couple less db's would change games' reaction, but they help extend the life of the bow by absorbing some of the excess energy.
I'm also a recent Ravin-club joiner, finally legal in VT for everyone this year (previously only disabled people could use xbows) so all I've done is target practice and chimpmunk control and thus am one of the least experienced people on the forum. Maybe it's a summary of what you learned reading the forums like an encyclopedia, but I figured since we're in a similar boat I'd share what I can.
I ordered some of Mr. bigbird1's 3d printed accessories, I'll share my thoughts on them after I fiddle with them a bit.
Also, lube makes the best things in life better.