Different expert here. I see the other expert, who is very good, opted out
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I see you have a couple of questions, and I'll answer those as best I can. Of course, these are fact dependent to a large extent.
what kind of problems can I expect from the IRS?
There are no problems that you should just automatically expect from the IRS. You would, of course, want to keep accurate records as to the income of your business but that is pretty easy to do with an online membership business model. Since you aren't really going to be using employees, etc. then the only real issue you have is with income and expenses. One of the #1 red flags for the IRS is a deduction for a home office so you want to be careful with that. I'd also suggest you hire an accountant to handle your finances and taxes ASAP.
What are your ideas on how to register my business?
I'm not sure what you mean by "register your business". If you are talking about whether to operate as a sole proprietorship, a partnership,etc. then you probably want to strongly consider forming a corporation of some type,possibly an LLC or even just a regular corporation. The S corp or C corp designation is one that solely has to do with taxes and most people choose an S corp.
If you have never set up or been involved in a corporation before then I'd strongly recommend you don't use a forms website to incorporate. You need a lawyer to advise you on how to "act like a corporation" because there are a lot of ways to mess it up and end up waiving all the protections a corporation provides you.
You also want to get a good set of terms for your website. I like the ones at http://rebellionbooks.com/products-page/all-products/website-non-adult-content-forms-bundle/
That bundle has most of the ones you would need and they are easily adapted to your specific business. No matter where you get the forms you are going to have to make some changes to make them fit your business.
I'm not sure what else you were looking for but if you have additional, specific follow up questions then please ask them in this thread.
If your question has been answered then I'd offer my best wishes to you and ask that you please not forget to leave a Positive Rating so I receive credit for my work.
Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered. In addition, once you issue your Positive Rating the question will lock open and you can come back to it anytime in the future if you think of something else.