Welcome to airguns!
You have a couple of nice ones (to start

) and you'll need suitable (for your applications) scopes for them.
Research the pellets that trend to work well in those rifles and start with those. You will likely want to test other pellets in the future to see if you can get better accuracy, but for now, keep it simple and get to know the airguns.
If you shoot a lot a compressor of a blessing to have. A second hand SCUBA is a reasonable source of High Pressure Air (HPA) but a 4500 psi Carbon Fiber tank is (IMHO) a wise thing to invest in, you will end up with one eventually
If you get into tuning (a hobby in itself), you will need a chronograph. The cheap ones work fine, ...so do the expensive ones. A set of good quality tools dedicated for your airguns is recommended.
I'd wait on getting "accessories" until you know what you need and what level you want to buy into. For example, a shooting bag you can make for a couple of bucks works as well as a $500 bipod. Just saying.
The cautions about airgunning being a money pit are justified (I have 25+ airguns) IF you don't have self constraint. Truthfully, I've got 4 or 5 times the money "invested" in fishing gear than shooting stuff so "expensive" is a relative thing.
Good luck! Shoot safe!
Cheers!