To get you started, you need to decide if you are going to "Do It Yourself" or do you want to buy the complete system and do more of a plug and play. Having electric at the pond is a bonus.
Will you be able to just replace the pump on the old system? Or, are you going to scrap the old system and start fresh?
I first looked into the Pond Lyfe systems at...
https://shop.hoosierpondpros.com/Vertex-PondLyfe-Aeration-Systems-VertexPL.htmYou could easily use the Pond Life 1, 2 , or 3. The #4 is probably over kill, but I don't know that there can be too much turn over within reason. I used the equivalent of the #3 on my 1/4 acre, 10 foot deep pond. It's plenty of aeration. Call Hoosier Pond Pros and they can make easy advise and sell you a system...OR...
You can do your research and design your own system. I have done that, but I have to say that you are not likely to save much money to brag about if you don't have "stuff" to start with and you plan on designing an equivalent system. With that said, you can find a used pump on the net, put simple pluming to some cheap diff users and you have air bubbles...No bells or whistles and less automatic and/or forgiving. If your budget is tight and you want air, it can be done for less. You will get the satisfaction of doing it yourself, learning from your mistakes, and customizing it to your liking. I would do it myself again rather than pay for a canned system because that's just the way I'm wired.
Give us some more details on your pond and your desires and you will find plenty of experience here to help guide your efforts.
