There are guides on the Bitcoin site. The mining software used for BTC (bitcoins) is the same for NMC (namecoins):http://forum.bitcoin.org
Phoenix is the miner I am using:http://forum.bitcoin.org/index.php?topic=6458.0
Download from there, and there's also info on how to use it
Don't worry about sending any BTC.... the more doing this the better
example of use with the pool:
N45u6NAUNSyfmvds6h8nndeSxinvHvLhmr = use your namecoin address .... have you generated a namecoin address for yourself ?
To generate your own address, enter the following from the command prompt within the namecoind folder: namecoind getgenerate
Have you installed namecoind ?http://dot-bit.org/Main_Pagepassword
: this is meaningless... put anything you like there... it's the namecoin address that is important
Sorry for the mish mash of instructions... it's late, and my head says it's time for sleep.
If your objective is to make money, I highly recommend buying and selling BTC. Good money to be made from that. Check out MT Gox https://mtgox.com/
... check the graphs, and follow the prices.
Namecoin prices have gone a bit nuts, but once that settles down again, that too will be good for buying low and selling high
Follow it for a bit, you'll soon see what's good.