WOW! 400 acres!!! Only minor downside, potentially, is the joint ownership, but that all depends on the character of the other two owners.
If you don't have one, I would try to get first right of refusal to purchase the other interests if any of the other two owners eventually want to sell.
Now, I think it will be important to make your share of the lake more desirable to fish by doing things with structure and cover.
Like others have already said, it is going to be a labor of love to figure out what all you have in the lake, fish-wise, and stocking of the lake has to be thought out carefully.
If embarking on a stocking plan, I would like to do as much as possible to keep the stocked fish in your share of the lake (if that is even possible). You'll have to keep the fish happy!
