Try to keep the cockpit as cleared out as you can. Less stuff to hang your line on.
Go ahead and buy the 5 lb anchor. I bought the kit from academy that included a clip, a rope, and a float. I immediately replaced their rope with 50 feet of 550 lb paracord.
I just lay my rod across the top of my yak with the tip over the front. You just learn to watch out for it.
Keep thy back cast upeth! It will almost feel like a steeple cast, but it keeps you from grabbing water on your back cast. Practice in the backyard, sitting on the ground. The geometry is about the same.
Fight the fish with the rod aimed at the point on the front of the kayak. That way the front of the kayak follows the fish.
I bought a Hook 1 Assault
paddle for sculling when I need to move around a little while fishing. Handy to help keep a fish out of heavy cover when I only have one hand free.
Get you a piece of the loop side of velcro with an adhesive back, and stick it on to side of your yak to keep loose flies from swirling down the scuppers.
That ought to keep you busy for a few minutes, lol.