Since you are not set on any one direction, it may be wise to check your tap water parameters.
They are easily found on most cities water dept web sites, if you are on a municipal system.
Success long term is often about matching your water with fish that are adapted to it.
Soft low pH (below 7), low mineral content water is usually perfect for Amazonian fish like cardinals, and certain soft water cichlids.
Hard, high pH water (above 7) works for Central American, and African Rift lake species.
If your water is neutral pH 7, not hard, not soft, most average LFS stock will work .
When you deviate with fish species that are evolved to live in extremes of either, long term chronic problem can result, making fish keeping less than a pleasant experience. Doing a little pre planning research about a fish you are considering can go a long way toward success.
The lack of which, is probably why one sees so many people selling tanks on Craigs list, or simply putting tanks for free on the roadside