Start it locally.
This whole “let’s all donate and have a shared agenda to open a bank in LA” isn’t going to work for people donating from Mississippi.
Start local chapters structured around supporting black businesses locally.
Then, find leaders who want to get into politics at the LOCAL level (assembly men and women, judges, school board, super intendent, sherriff) and then influence politically to lobby for the same American tax dollars that go to other organizations.
The internet is cool but it’s rife for misinterpretation/scamming/mis-appropriation of funds, etc.
Instead of starting with a grandiose plan to cut out Wal mart, let’s create local ecosystems to help each other.