check the number of digits in the network hash rate, and I think you will see that you are off by three orders of magnitude.   The current network rate is ~2.48 EXAhash (10¹⁸).

Sure. The node is still syncing the blockchain. It's on block 440,750 as I type this, but man is it slow. I'll post when the P2Pool node is "sane."

If you are going to mess around with GPU mining and altcoins (Ethereum, Zcash, etc.) be sure to check out the altcoin sub-boards. There is a ton of info there, and is where I got started. Don't bother trying to mine Bitcoin with a GPU unless you like pain. GPUs don't have enough horsepower compared to an ASIC. Gaming and mining don't necessarily go together, but they can if you do not care about return on investment (ROI). phillipma1957 and eliovp are two people who have a boatload of info and know what they are talking about from my experience. There are others, but you will figure that out when you start reading.