In addition, if you are in a sailing area now, visit the marinas to look at different kinds of boats, talk with owners about how they like their boats, what kind of sailing they do, any problems with their boats, etc. They might even take you out for an afternoon sail, which could be helpful to you if you haven't sailed in a while, to refamiliarize yourself with sailboats. As well, do some reading about "systems" on a boat--plumbing, electrical, etc. as you will likely need these if you are going to live aboard. It is important to understand how they work, advantages & disadvantages of different set-ups, etc.
Once you have gained a little more knowledge, and have an idea of how you will use the boat, what size boat you are looking for, what price range, what systems/amenities you want, etc., then folks here can give you better advice on next steps to live your dream.