Okay so here are my observations having worked and shopped in various bike shops over the years.
1. Pimpery is all very good but dont forget the basics, loose bearing nuts bolts that type of thing, as i recall i think Raleigh sell a good starter set for trade, these parts can be used on all types of bikes right from the bso up to the most niche of bikes.
2. Remember that bike repairs are one of the highest profit margin of anything else you do and that doenst include the parts that go with them. Dont turn your nose up at BSO's perhaps even offer a christmas assembly service at a set price.
3. 9-5 Forget it, you wont see many shoppers before 10 or even 11 most week days and youll see many more after 5 after they finish work.