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At your size, you might also not want to rule out some of the bigger recreational sit-inside kayaks that turn up on the used market. They can be fine for fishing too, and you can customize it to fit your needs (to a point). Best part is that they tend to be very affordable - even the good-performers. Prices are often negotiable.
Stick to those 12' or more in length. You are large enough that you could do well with some of the tandems in solo mode. This one isn't close to you, but just as an example...
I'm not quite as big as you, but I sometimes fish from a 12' Wilderness Chesapeake that I paid a whopping $150 for (probably not an easily repeatable deal). Recently bought another rec boat for my daughter "OT Loon 111) for just a little more.
These "pedigreed" rec kayaks are decent performers and easy to learn in, but still cheap. Buy used and don't over-pay, and you can turn it over for little or no loss when you have more money and more of an idea of exactly what you want/need - which may or may not change with experience.
excellent choice! these are well made very stable and loaded with features and at a great price compared to yaks like Native or Hobie. men pushing six foot five and well into the three hundred weight group have bought these and compliment them, look them up on the net vibekayaks.com and scroll down to the facebook icon and read what others say about them. the vibe tribe has come up with many mods to make it personally yours and really cool stuff like bluetooth speakers, battery placement for fish finders, anchor trollys and homeade carts that are much cheaper to make than buy. read the site it has many great ideas that i couldn't find on other kayak sites. i bought mine at Verticle Drop near Cinci Ohio and they if you wish let you try it out before buying. also the company is in GA and may be closer to you. happy shopping
I'm a big fan of the Vibe Maverick 120 Kayak and just wrote a review that might be of help.