It will be a flop, most people use bit.ly and do not stray away from it. I have a url shortner that I have had for about 2 years and it only has had about 3,000 links shortened (a large chunk from api requests).
Firstly, i wouldn't recommend but if you do choose to do it, make sure you choose the one like bit.ly where you get paid to shorten links and need to go through ads page. This would earn you the more money than an ordinary one.