This depends whether you are having a provisional application filed or a non-provisional application. Although a provisional application has lower filing fees and lower costs to draft the application, you may want to go directly to having a non-provisional application drafted and filed if you are ready for the invention to be examined for novelty by the USPTO. The cost to have either the provisional application or the non-provisional application drafted depends on how complex the invention is as well as how much time it takes to draft the application. Contact me directly for more details.