A plywood flat bottom skiff is an easy hull to build. Once the hull
(bottom, two sides, transom) is built you get to learn how to put in
seats, sail, or whatever else you want to learn to do. An Internet
search on "skiff" will bring up plenty of plans as will a look at
www.boat-links.com. The free plan at www.simplicityboats.com uses 2
sheets of plywood most efficiency. There is a BASIC program on an old
website of mine that will calculate numbers for different sized of
skiff ( www.ncf.ca/~ag384/Boats.htm ). Look at my Dogskiff to see how
to install a small offset daggerboard slot for sailing.

If you want more of a challenge in a hull you can try wood strip or
lapped strake (aka lapstrake, clinker) construction, or a mulitple
chined plywood hull.

Have fund.
Try not to get addicted.