When I started out, I was content with a recreational kayak, paddle, life vest, rod/reel and tackle box. As I grow in this sport I’m starting to add a little more gear like, rod holders, anchor, fish grips, and a small cooler for drinks and snacks. I haven’t tackled electronics yet like fish finder and Go-Pro video camera, but there’s always tomorrow.
Based on your kayak trips you can tailor what gear will work best for you. For me my outings are usually half-days on weekends at local lakes, so too much gear, besides the essentials, would be overkill. My goal is to hit the water as quick as possible and not spend time loading extra gear and hooking up electronics. I just enjoy being out there, and catching fish is a bonus. My advice as you start out, keep it simple and add as you go.