Fly fishing is definitely a rabbit hole. You can literally spend thousands on it and still justify one more purchase. But there are ways to do it on the cheap. If you want some ideas let us know what fish you are going after, what water you are fishing, and we'll spit out what we know works. I've personally fished mostly steelhead with fly rods, some trout fishing, and salmon. I've not ventured into the salt though. It can be done for really cheap, you don't need a sage rod and hardy reel. That said, your casts will benefit from a matching line to rod. If not matched it can be a mess.