If you know much about mini ponds, koi ponds, backyard ponds, waterfalls, etc that is a great area to get started, especially if you live near a big city. People typically spend way more money maintaining those types of ponds than they do on farm ponds.....
In order to get this thing rolling you pretty much need to turn your hobby into a complete obsession, find your niche, start small, and gain experience by getting your feet wet (and muddy).
Stocking fish is what got me rolling (everyone needs fish, especially hard to find ones), then we kept adding products and services like installing aeration systems, lake dyes, bacterias, algaecides, herbicides, fish structures, feeders, etc. Then we added electrofishing surveys and now consulting is our main business.
Definitely not an easy process, but very doable. Knowledge of ponds and fish obviously is a must, but here is the most important aspect to a successful pond management business- learn how to manage a client. Pond owners are even more diverse than ponds and if you can learn what a client wants and how he wants to get there you will be successful.
