Single hand fly rod: 9 feet long, graphite, medium-fast action, 5 weight. The reel can be inexpensive. I would steer clear of packages but an inexpensive, entry-level rod should be fine.
Get a weight forward (WF) floating fly line to start with (5 weight to match the rod). Do not skimp on the line; buy a quality expensive line (Scientific Anglers, Rio, Cortland, etc.). Behind the fly line there should be some backing. Perhaps #30 lb. braided dacron.
The 5 weight might be a little heavy for trout on occasion and a little light for some smallmouth bass situations but is otherwise a great compromise.
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Double hand fly rod: What's this? You literally hold the rod with 2 hands. It increases the leverage and significantly reduces the stress experienced casting throughout the day.
Downside: it takes a little longer to become proficient at 2-hand casting. The equipment is slightly more expensive.
Reward: If you suffer soft tissue injuries or are simply old, and you have good technique, 2-hand casting reduces stress and required effort.
I single-hand fly fished for over 4 decades before trying out a 2-hander. Now, I fish exclusively with 2-handers. You will to if you get into this sport seriously. I have wondered if a beginner could start right away with a 2-hander.
Something to think about or keep in mind for the future.