If I got you right you are planning to open an exchange , right ? In my opinion there is shitload of exchanges around here so incase you will offer something new and unique then I don't see why would someone use your exchange in the first place .
Make sure to open in different countries , (not only europe , Asia , America etc ... ) Worldwide ! Make also sure to give pretty good fees comparing to the other exchanges , and finally .. make sure to accept different payment methods .
The problem is it is very epensive to be a exchange. They pay lawyers a lot to make sure they are legal, and set up in certain countries and pay for licenses and follow all kinds of laws. This keeps them from money launering or basically a lot of time in jail.
Most focus on a region as cost is so high to do, so they focus on certain areas. A worldwide exchange will not happen unless rules change alot.
Only ones that seem to get around it are the ones that just do digital money, an never touch fiat. But those you can not put money into from bank or send to bank, etc.