Need advice for new at Kayaking

[Robalito]

I have been looking for a way to get back to fishing. I tried surf fishing here at Melbourne Beach, Florida and was not impressed. Yesterday a friend loaned me a kayak and I went out with him for the first time. This I enjoyed. I want to get into it, and I have been reading the different comments on this subject. My questions are as follows:
1. It is recommended to try different kayaks before choosing one. How do I do this??Where are kayaks available to try out?? My friend is the only one I know who uses a kayak in this area. Are there clubs??
2. Has anyone had any experience with the "wavewalk" kayaks?? Are they worth it for the stability?? It looks like the room is limited to put things.
3. I will not be going out in the ocean. Just Indian River and perhaps a few lagoons in the area. Would a 10' kayak be sufficient?? I can put on a couple of rod holders. Besides this I will just need room for a small cooler for water and drinks, perhaps a small cooler for the fish and a small tackle box. Is this asking too much with a kayak??