What's there to know about the hidden wiki? It's a wiki on the tor network, you use tor to read it. If you are new to tor you really need to read it. kpvz7ki2v5agwt35.onion
The tor website does an excellent job of explaining how tor works, if you really want me to I'll try to explain it.
https://www.torproject.org/about/overview.html.en
If you have any specific questions about tor feel free to ask here or pm me.
If you are interested in other, similar programs I can mention a few.
The easiest way to get enough bitcoins to buy drugs (I'm just kinda assuming this post has something to do with the recent press coverage of the silk road
especially considering this is a forum dedicated to a drug) is to just buy them from a service that sells them. Granted you have to be careful that you don't do it in a way that it can be linked back to your "real name." Cash by mail can work as long as you don't use your address for the return address. Prepaid credit cards are an option for some of the bitcoin retailers buy in cash might want to do it at a store that's not close to where you live just in case. You can also try to be paid in bitcoins for offering various services. Also make sure you only use a bitcoin seller that operates on a pseudonymous network like tor or i2p.
When bitcoin first started most of us nerds had enough computing power lying about to make a decent bitcoin miner. The trade off was you couldn't do much with them. However more services are accepting bitcoins (there are plenty of perfectly legal goods and services that you can purchase with them) and it's getting more costly to build a decent bitcoin mining box. Some groups are teaming up and splitting the bitcoins they make so that is an option.
Be aware that bitcoins are in effect pseudonymous with both the identity of sender/receiver and the amount of bitcoins that are being transfered are broadcast to the entire network. It is vital that you do not allow your bitcoin account to be linked to you "ture name".
If you have any more specific questions feel free to ask. I'll admit I know more about tor and the wiki then bitcoins.
edit: Here read these to learn about getting bitcoins
https://en.bitcoin.it/wiki/Anonymity
https://en.bitcoin.it/wiki/EWallet
https://en.bitcoin.it/wiki/Buying_bitcoins
https://en.bitcoin.it/wiki/Selling_bitcoins