There are plenty of options out there. Check with Bass Pro they will have rod holders and such.
Also there are after market rails and rod holders made by Ram mounts that take just a little imagination on your part.
As for shade, you can rig up a golf umbrella but kayaks or notoriously hard to fish in the wind, and it takes some getting used to in order to make it work for you.
An Anchor trolley should be on the top of your list in accessories since it will help you manage the wind.
Instead of shade such as umbrellas most kayakers use a broad brimmed hat and a buff to wear over the face, long sleeves and gloves for total UV protection.
In a kayak you sit pretty much at water level and just the reflection off the water can be brutal on the skin.
Before you install anything though, go fishing with the kayak in bare bones and try to figure out where you want rod holders mounted that will be out of the way when you paddle. You will get a feel for it better than just randomly installing accessories just because someone else has them installed there.
Good luck, and welcome to the forum!
Just one more cast!