Neat, I really want to try building a boat! That does seem like it would be really fun. I started on a kayak once but didn't finish it and ended up cannabilizing many of the pieces for another project after a long-time kayaker friend of mine explained some of the big flaws in my design (I have a strong tendency to get creative with designs, for better or worse), and when I realized that my wood selection was highly suboptimal for something that would get heavily exposed to water. I really need to try again.

What type of wood would you recommend? Do you have any favorite designs you would recommend using as a starting point?

Check out forum.woodenboat.com to read from a lot of amateurs taking on the project, just be warned that the rabbit hole is alluring and very deep.

It's typically not recommended to self-design, the physics gets technical and there are a lot of free working plans out there including by famous naval architects.

Most people start out with simpler designs using plywood and fiberglass but, due to my aforementioned disdain for a lot of modern approaches, I personally went with a traditional oak frame, cedar plank, copper rivet construction. It is very time consuming but I'm enjoying the journey. I chose a flat-bottomed sail boat design (dory) to make it a little easier on myself.

There are endless variations on the concept of a "wooden vessel that can be propelled through water" idea so it really depends on your interests and tastes. It's a "form follows function" situation too, so you also need to consider your use case -- engine, oar, sail; ocean, river, lake; etc.