You can do exchanger and earn something with it
becoming an exchange is an easy job because you're just selling and buying bitcoin, certainly rate will be slightly different from the existing Exchange site because you would surely benefit you certainly will add to the existing rate, but to become a famous exchange is a difficult thing
It will take time to gain trust from the people on exchange site as generally people prefer to sell their coins who have 1000+ trades on their profile as they are the most trusted traders but to reach 1000+ it will surely take lot of time.