Considering do a CASH/BTC and BTC/CASH side hustle. WDYT?

I live on a lake near Tulsa and these towns have money around. I want to OTC trade cash/btc btc/cash only face to face. Distance would be a function of amount. I figure I can make a couple of contacts on the web if I need to replenish. Not doing anything shady just don’t want the banks and exchanges in my business, kinda the point behind bitcoin.

Is 15% commission either way a good starting point?

Any gotchyas ?

Learning resources? Alread been through the 'Tube.