first of all go to the announcement topics and check where you can sell them. there is always a link there. and also there are sometimes people there selling and buying coins and tokens in each announcement topic underprice if there is no exchanges available.
other than that you can go to
https://coinmarketcap.com/ search the name of your token and check the market tab to see the list of exchanges having the token you want to sell.
The link is not always good and sometime phising so i would suggest you to verify every link you get anywhere.
Second, coinmarketcap is good idea to check where we can sell our token and we can check the volume or circulation of the token in exchange.