when I tried to create a new one, I only crated a new wallet.
What happens when you restore your wallet? To restore your wallet from seed go to file menu > new/restore. Then enter a name for the restored wallet. The wallet creation wizard will start. Select "standard wallet" and then click next. Now select "I already have a seed" and click next. After that you will be asked to enter your seed and then set a password if you like. Follow the on-screen instructions until your wallet is created. You can then send the money to coinbase.