If it's a small type local independent business be very polite and ask everyone if they want help. Be personal if you see what i mean, e.g not hi how can i help , but, hi there you alright? friendly and not like a robot who works in tesco. Erm hmmmm, always look busy, tidy the shop, dust n shit, pump up tyres on bikes. Leanr about orders, repair jobcards, everything! Just be cool and have a sense of humour. nobody likes boring people!