well I certainly wish you all the best with your search!
the reason that I ask is I was wondering whether you can support yourself in a sitting position comfortably and for extended periods of time? combined with sitting (core/back and stomach muscles), you'll also need a degree of flexibility to paddle and reach for equipment during your time on the water. this is essential to maintain your balance on the water and to prevent you getting a dunking every time a wave hits.. I'm also curious whether you have the strength to right yourself should you happen to fall in (if you're a strong swimmer with good upper body strength this should be easy enough)
I don't want to put any negativity on your enthusiasm, but I would like to see your first experience be a positive and encouraging one (as well as a safe one).
Have you investigated whether there are any kayak tour businesses in your area that cater for people with limited disabilities? A trip in a tandem yak with an experienced instructor may give you a great intro to the joys of kayaking whilst keeping you as safe as possible.
Good on you for having a dream! I hope that everything works out and look forward to keeping an eye on your progress.