Originally Posted by: Dr_simonessential add-ons

A set of near-field flat response monitors (not less than $100)
A cheap channel strip (preamp, EQ, de-essing, compression) ($100)
A Shure SM57 ($100)
An MXL / Behringer large diaphragm condenser ($100)
Extreme isolation headphones ($100)
XLR Mic cables (don't get the cheapest ones you can find they will suck !)

All can be found at www.musiciansfriend.com or even cheaper on eBay.
I'd not spend too much starting off incase you discover you hate it