I have incorporated (s-corp), created a couple LLC's and briefly used a sole proprietorship with a DBA filed in my county - this one was by far the most annoying, time consuming, and confusing one. The state filings took maybe 10-15 minutes of filling out straight forward online forms, $1 (at the time for a name search) and $300 to file. Soon after I was the paper owner of a legal corporation (or LLC's). The most complicated part was understanding taxes, but the application of taxes is separate from starting the company (assuming you understand the best tax structure for what you are doing). If anything, an Accountant is way more important imo.