New In Mining

Dear,

I found a tutorial in the net and i went through it to start mining, so till now i was able to run the following steps:

1) geth --rpc --fast --cache=1024, this one looks like importing files/blockchaine

2) In different cmd i am running : ethminer : it will create DAG file and then Mining on PoWhash

3) I will open a third one : geth attach : and check (eth.getBalance(eth.coinbase)) showing 0 despite eth.getBlock("latest").number showing 1138487


So can you please explain for me what are doing those steps, and is this enough to make the mining, if yes why I am still having 0 as balance.
also I am not able to see anything with my address here www.etherchain.org/account

Thanks In Advance,