I have a market stall, well I will be back at it now it is warmer, I am getting a trailer renovated to save time flashing up in the morning. I like the idea of parking up to book my spot and heading off to find a bacon roll. Back 2hrs later and open the hatch.
In the summer I sell at fairs and gala days.
If this is your first retail venture I would recommend a pound stall at the market first, less hassle and less overheads. If going for £1 lines you will have to hunt down suppliers. As has been said you won't get credit at first, a letter head is usually enough for them to get started though.
Do you have a retail unit in mind or have you not got that far yet, a stall will need a lot less stock to fill it up. You won't need a till, shop fitting, planning permission for signage etc.
You will need a stall though but you can start with a trestle table (not just a pasting table) and a cheap gazebo. Stalls can be bought second hand see Ebay, unless you have a big vehicle look for car boot models, this means it fits in your car boot as it shorter length poles.
Remember you will have to fit stock and the stall in your vehicle.