Congratulations on make the switch to the light side!
I'm going to disagree with
@jssailem, go to the SBO store and buy one of everything.

@phillherring will appreciate it.
Seriously, when I have bought a new to me boat, I have a priority list for purchases. At the top of the list are items that are essential to the well being of the boat and making the boat "legal." Items on this list might include required USCG safety gear, dock lines, fenders, halyards, sheets, hoses (although you probably have very few on the the 22). Some of this gear will no doubt be on the boat and some of it will/should be replaced. The first boat I boat back in 1984 is now in my marina. It is on the 4th owner and they are still using the same dock lines I used 30 years ago, I recognized the leather chafe gear I sewed on the lines. Old lines break, broken dock lines lead to drifting boats and damage to the boat and other boats.
Next up are personal safety gear, life jackets, foul weather gear, shoes with nonslip soles and so forth.
Then secondary safety gear, things like a handheld VHF (floating and waterproof) and a Life Sling.
Finally are system up grades, although on a Catalina 22 there aren't many systems to upgrade.
With all that said, be sure to buy a couple of things to make the boat your own. Pillows, dishes and (Lexan)glassware, whatever suits your fancy.
There are more marine retailers than West Marine (previously known as worst marine, but they have been trying to be better over the past year). Sign up for their news letters and ads. West has taken to offering one day sales on items often at a deep discount. Places to look at: Defender.com (sign up for their weekly special), Hamilton Marine, Fisheries Supply, Annapolis Performance Sailing, and Jamestown Distributors. There are patterns to the sales and specials. Look for big sales during the Spring and Fall boat show season, Annapolis Performance Sailing (APS) has a big sale on line in January, Defender has the best deals during its warehouse sale on the last weekend in March.
In the meantime enjoy and dream, unfortunately it may end up being a long winter staring at marine retailer websites.