Send some Bitcoin (BTC) or Ethereum (ETH) to your new Binance account. You will be using this to purchase your Tron TRX coins.
How to send BTC from Coinbase
Go to Coinbase and click the accounts tab, from here you can send cryptocurrency from Coinbases wallets. Choose BTC or ETH and send it to your new Binance wallet copied and pasted from your Binance account