Best of luck - remember - the first guy who built a canoe probably looked crazy to all his friends. Now, canoes are everywhere!
in my country is full of canoes, so full that I get headaches, and you know why I have headaches? because the people of my country build canoes for years and do not think of creating something more evolved, something like modern boats.
like @vod said, you need to win people's trust, but since you also said that you are still planning and from what I realized, it will not be so soon that your exchange will be launched so you have a lot of time to gain people's confidence and on that point "conquering people's confidence" I will suggest the following:
step one: you should create physical office
Step two: You must introduce yourself with your real name
do this, your exchange will be very successful