If you are offering work create a profile that shows off your talents. Upload an mp3 of your work, a photo perhaps, and embed your soundcloud page.
Post your Job
Create your add e.g. '12 bar shredding guitar solo's for $50'. or 'Guitarist needed for for a 12 bar solo will pay $50'
Receive Work/Book Work
You will be notified when someone clicks 'order' and wants to hire you or accept your work proposal.
Send the completed work
Once the client is happy with your work, send the final product in the form of a.wav file through the producethesong messaging system. The client will release funds from their escrow account to you, and then buyer and provider rate each other and leave feedback.