1. easy to handle ( for a first timer) craft with decent trailering and big and comfortable enough to spend week long vacation trips on board.
2. Were wanting to spend a summer on one of our local lakes learning the ropes as it were then next summer take it down the arkansas river to the icw then to galveston tx.
3. From what I've researched a swing keel would be our best bet. There are some shallow spots between tulsa and Arkansas ( thats as far as I've gone in a motor boat) what would you suggest?
Let's go back to the original "criteria."
1. Catalina 22 meets those. Since we don't know how big you are physically, it's hard to answer how long you can spend on the boat comfortably. Weather would have a lot to do with it, too --- if it's warm you can swim and get off the boat more often than if it's cold and you're "stuck" on board. We once spent a three day weekend hunkered down behind an island in rain and high winds. Boat got real small real fast and we were newlyweds at the time!!!

We bought our 1981 C22 in 1983 from a nice family who had two teenagers, and the family was well proportioned - not fat just big nice folks. Guess why they sold the boat?
2. If you buy the boat and decide you want something bigger, Joe's point about resale value is well taken. However, it would also work for your planned trip.
3. Shoal draft with a swing keel is a good compromise, don't forget a kickup rudder, ours didn't have one with the swing keel, but we sailed San Francisco Bay which is deep.
We eventually got a C25. What you'll find in that size range is that when you move up those few feet the volume of the boat DOUBLES. We kept the C22 for a few years, trailering it up to a lake for the summers where it stayed in the water, bringing her home for the winters and sailing it off the trailer. PITA eventually. So we bought the C25 and kept her for 13 years, fixed keel, in a slip. Much easier to use regularly. The 25 had a pop top and enclosure for bad weather, so standing headroom really helped. We spent much more time aboard, rather than the daysailing we did on the C22 when here for the winters or the two or three days (one or two overnights) on the lake.
So, as far as size alone is concerned, you have two choices: go small and see if it "fits" you, sell and move up, or buy bigger now. The differences in learning to sail the two are negligible.
Whether you go Hunter, Catalina or Mac, these "size" guidelines should help you out. The rest is based on your taste and budget and availability of boats for sale near where you live.
Good luck, and welcome to this happy group.