Just want to add-- I grew up sailing Sunfish. I would sail a catamaran with my uncle but never at the helm.
The first time I took out a bethea by my self I figured out the jib in all of about 5 minutes. Really there is not much to it.
I think a lazer is the perfect boat to start with. Cheap, dependable, lots of boats out there and a plethora of guides and parts for any questions or needs you may have.
If you want to go a little bigger I would recommend the Bethea. 18' with a full sailboat set up. Those things can MOVE to! Loads of fun on a breezy day and great boats for taking out more than just yourself. Lazers get cramped pretty quick.