setup a bitcoin exchange - best liquidity providers

[Cexex]

I want to setup an easy bitcoin exchange in my country, people will pay by card and bank transfer, the question is where should I automatly buy bitcoin when my clients make an order? to have a small profit on transactions.

[Queen12]

But you need to think about the law, but if you want to open an exchange, you need to have a certain amount of bitcoins that can be exchanged.