In the first place，you need to check which token you want to sell on which exchange can trade，and then registering an account on that exchange.You can start trading after registration.
Your suggestion is totally waste because they ask 3 months ago but many peoples are suggest in today. I think already they get answer for trading but someone is wrongly enter in this thread automatically others post the spam thread. If you post something first check the creation date then post it properly otherwise it is not in use for this forum.