Your topic is very big. 3 to 4 square meters is difficult and rare, usually starting from 31 square meters. Unless you share the rent, it will be very troublesome.

As for the location, the rent in the prime location is expensive, and it is estimated to be saturated now.

I suggest not to go to those well-known locations and business districts. You can choose some sections near the transportation hub, where people will not be less, but the price will not be too high because it is not around the business center.

As long as there are light rails at the station and subway exits, there are no tricks.

I think you should be prepared for failure first. There are still many unknown things to happen.