First of all you have to make a registration on the top exchanges (My suggestion is to make accounts on top exchanges because it is more secure)
Further, in order to be able to change big amount of tokens you should pass the verification process(it will take up to 5 working days but usually faster), after that you will be able to make a daily withdrawal up to 100 BTC (for example on Binance)
After that you can transfer any amount of BTC to localbitcoins or other exchanges.