If he got enough funds then he can have a good team and build a site but now to run exchange site mostly need a licence from local governments because most of the exchanges are facing these issues. Definitely, it is not an easy thing to implement if you don't have a minimum knowledge of how these exchanges will work.
Obviously, if OP had the capital and actual interest to do so, he wouldn't be asking for help or advice here. The last thing we need in this market is yet another utter shit exchange not being able to serve people.
An exchange requires itself to be registered to comply with each law in order to operate legally. Launching an exchange as 'hobby' without being registered is illegal, and subject to incompetence. Problems guaranteed.
Also, most of the many new shit exchanges that this market counts, don't even manage to remain operational after their first year. It's not a money making opportunity, so for that purpose launching an exchange is wrong.