Where do I even begin???

I have extremely limited knowledge on boats. All I really know is that I need one that is big enough to hold supplies, preferably still having enough room to be comfortable to live aboard for a few years, and that it needs to be small enough that it can be managed without much effort or concern. Based on what I have come across so far, I am thinking I will need something about 30′, but that could easily change if I see a boat and fall in love with it. Also, some sources say that 40-45′ is recommended for bluewater sailing. I’m not going for speed, so smaller isn’t really necessary. I read about the Caliber 40 LRC, Hylas 46, Island Packet 420, Tartan 3700, and Valiant 42 as being good, affordable bluewater sailboats. The Tartan and Valiant have been fairly prominent in my readings so far, as well as the Westsails.  I also am not sure if I want a catamaran, sailboat, or something else entirely, although I’m also not really quite familiar with what these mean and what my options are! I think I need to start going to weekend boat shows! I am planning to take a basic keelboat sailing class soon, so hopefully I will know more about what I am getting into!!!