[Yakin]

your PFD(Life vest)
a radio
maybe a dry bag
if you get some pole holders go with scotty or ram mounts and get yourself some rod leashes
Once you get the funds I would say get a bait tank first or make one
then a fish finder
every now and then OEX does a day on the water to where you can test drive some of their kayaks
sometimes when you buy a kayak all rigged up yes it will be nice but you want something you feel at home
something I always remember when I am buying a kayak
long+skinny= fast
short+fat= stable
it all depends on what kind of fishing you plan on doing
My hobie PA I can stand up in 3'-6' swells and take a piss no problem

If you want to learn some great things read threw a lot of peoples forums
If you want to watch some videos on youtube all about kayak fishing
search yakintexas,ty southerland, 30milesout