Well the first thing you need to do is to know whether your token is been listed on an exchange, be updated on the project you join. Second, when your token can be exchange, you should have enough eth to put your token to the exchange, if you have enough eth then in the exchange, you need to make an account, get the address from the account you made in the exchange, and put it in the address you'll be sending your token, after a few minutes your token is in the exchange, put your token on sell or if there are people want to but your token just choose the buy then after it you have your profit, that eth you get, should be send to your original wallet so that you can have the pyhysical currency.