I don't know if you are serious, judging by your writing style you are probably not serious and don't have the funds to start an exchange. But if you do here I go with my answer:
I have experience in this kind of business field. I can tell you one thing: It's not easy.
First of all to start your exchange, you will need a good amount of money for development, and legal fees (FBI will go after you if you don't follow rules) don't think you can start an exchange by just having an excellent platform and a "domain." Depending on where you live you will need to check out for licenses for money services and other ones based on your location. You should be aware that to accept US clients you will need to follow several US laws, check that with your lawyer (get one, if you don't have one yet)
Building an exchange is not a game or a $1000 startup business.
Now let's discuss development: You will need to have some legal structure something like an Onshore or Offshore company, and you should have your development team sign an NDA and some other contracts depending on your situation. (Professional help is advised)
Then you will need some staff to get over AML, Support, and Verifications.
I would suggest hiring a crypto consultant for security matters such as cold storage and keeping clients funds safe. The last thing you want is to get hacked.
Server speed is very important and everything should be high performance. As said before: Funds are the key here.
If you have the funds and the team, you can make it possible. Please don't take my advice as professional, always hire a professional for legal matters.
I wish you all the best
Stay out of trouble, avoid the feds and Interpol.