It is pretty easy. Someone will post their assignment with a pledge amount. If you feel that you are able to do the assignmrnt than you can, than do it but make sure that it is someting that is substantial in nature. The one posting the assignment will choose which answer best suits their style or needs for that assignment and will pay the amount that they pledge. If you feel that you need more information or you feel that the pledge should be increased for some apparent reason that you can request for that. As far as payment is concerned, it all depends on the amount of work you get done. Since you are new to this start with low bids and build your client list as well as your reputation on this site. Once you have earned $50.00 or more you can withdraw it in a form of a check or through Paypal. As for the nature of the work that one deals with all depends on the assignments posted and to what degree of experience or education you have. Set your profile up so that others all able to review what expereince and knowledge you have.