Hello,
I am a US-licensed patent attorney with over 13 years of patent experience. I have drafted over 100 applications from scratch and have registered over 1000 patents.
I hope you are referring to a provisional application. For $500, I can offer guidance with drafting the provisional, revise your draft, and file it at the USPTO. Please note that the majority of the drafting will be done on your end.
Sincerely,
Sean