Well to start you first need a sound card. If your computer has one that should be fine, otherwise you should look at getting one.
Dman pci AUS$350 (anolog I/O, Midi I/O, built in moduel, 16 bit converter)
http://www.midiman.net/product.HTM
Isis AUS$750 (anolog 4*I/8*O, Digital I/O, Midi I/O/thru, built in moduel, 20 bit converter, also heeeeeeeps of softwer)
http://www.guillemot.com/northamerica/index.html
Delta 66 AUS$1109 (anolog 4I/4O, Digital I/O 24bit converter)
winman 1*1 midi I/O AUS$120
http://www.midiman.net/product.HTM
Delta 1010 around AUS$2000
• Configured as PCI host card with external rack-mount unit, which houses all converters.
• 8x8 analog I/O is balanced or unbalanced on 1/4" TRS connectors.
• +4/-10 operation, individually switchable on the external rack-mount unit.
• S/PDIF I/O on PCI host card.
• Full duplex operation.
• Word Clock I/O.
• MIDI I/O
http://www.midiman.net/product.HTM
you also need to decide what recording you will be doing
A mic of some sort is a good way to start, maby an SM58, and you need some softwer(if you don't get isis) i use Cakewalk thats works well for me. You will also need monitors or a headset their are heaps of good ones around if you don't have any.
This is how i would do it it isn't the only way so don't just go by my info ask around.
Also tell me how it goes.