I jumped in with both feet, now what?

I agree with the list above.
I would also add... Research what you will need to reseal the guns when problems arise because they will. Stock up on those seals/kits before they go obsolete. Grab some of the proper lubes while you're at it.
If you go with a compressor do the same for that as well.
Having a compressor is a great convenience until it breaks. Then you quickly learn how much you've become to depend on it.
If you go with a tank, make sure your choice for a compressor is capable of filling it.
Welcome to the rabbit hole.
 
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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!