You're the boss. You never serve anybody yourself — you lay the place out, hire the staff, set the prices, and watch what happens.
Arrows move the square you're pointing at. SPACE builds there.
1 shelf 2 till 3 plant 4 sign 5 sell it back
B Business Bureau H staff P prices ? help X start again
Start with: a shelf, a till, and one cashier. A till needs a clear square above it for your cashier and below it for the queue.
Charge more and each sale is worth more — but fewer people come in. That trade-off is the game.