Setting up wallets, getting real money from ETH coins from the ethermine.org pool & coinbase

OvalPistonOvalPiston Member Posts: 3
edited December 2017 in Pool Discussion
I'm not sure if I'm doing this right, or understanding it?

I first created a wallet ID with geth.
I then mined with ethminer.exe in Windows going to ethermine.org.
I now have 0.75 ETH, broken up into multiple transactions.
I created a wallet ID at coinbase.com, and my coinbase account is linked to my checking account.

Questions:
1. Do I even need an ID at coinbase? I assume I do so I can then transfer ETH to USD?
2. How do I get the ETH I have at ethermine.org pool into coinbase? Do I have to run geth commands to do the transfer?
3. Am I correct to assume I need a minimum of two wallet IDs? One for mining and the other wallet to transfer ETH coins into, so I can then transfer them to USD?

Thank you!
or to comment.