Well Welcome
@LakeMan. You post your first Hi, guys and already you have 25 responses and a couple of them are of differing opinions. Is that not the coolest.
So here is my 2cents. Worth 2.75 cents in Canada... (Ha I crack myself up).
I like the "beater boat" idea. My first sailing experiences was with ta sailing club. They provided introductory lesson/experiences and let you out on their boats. You break it you had to learn to fix it. The beater is much the same.
The idea of learning the experience is one best enjoyed on the water. Be it with your own 14-19 foot boat that you found locally for cheap, or as a member of a club. Kind of depends if you are a joiner or loner. There is good things said about both. When you have survived and you and you want to know more (and there is so much more to learn) then the classes or sailing with an experienced sailor/friend makes a lot of sense. There is truth in being "I do not know what I do not know or need to know" condition.
@capta is so correct in that some lessons are so structured that they detract from the experience. Now days there are a number of options available. If you are a "I got to get a certificate" guy then the formal lessons are the resource. If after the first "Oh my god the boat is leaning, Will. it tip over and drown us" experience and your wife still wants to participate in this "bucket list" idea. Then Take Lessons together. Great way to help each other. You will likely find you pick up on different ideas and these will serve you well as you take this fun to higher levels.
For Lake sailing I enjoyed a 15 foot Montgomery. Sturdy, sloop rigged, tippy but dry boat. In fact there was only one way you could tip it up on it's side to where the man touched the water, and it was not a likely procedure to attempt by 99% of sailors. It was big enough to have space for 2 in the bunk. It was a great one person boat. I beached it all the time or anchored in 2 feet of water.Trailerable and rig-able by one person. but it was like camping in a Pup tent.
It was a boat that when I had finished with was still of interest to others. That is what is called a moving on boat. After you use it you can sell to or give it to the next new to sailing sailor and Move On.
Look for a moving on boat that can give you fun and instruction. Cheap to buy and own. Play together and move on and up. Or you could be like some here and become a "Collector". Parking your boats on your property as a memorial to your experiences.
There are really no rules. Your Boat your choice.
Fair winds and stay in touch.