You should start with Binance, as it doesn't require KYC if you want to withdraw up to 2 BTC per day, more than that you need to pass KYC. Moreover, it is one of the best & biggest exchange with in terms of high volume & high security. If your coin/token you gonna trade isn't listed on Binance then you have to look at their website or on CMC for the exchange that has listed the token you are holding and can trade only there or try forkdelta Dex exchange for ERC20 compatible token to trade.