This is a two part answer:
Short-Term: first 30 days
These are not required to become a dealer, nor for you to start making money, so our short term answer is not to worry about this for the first few weeks. The best thing you can do to build momentum by sharing your products (website if you have one) with all your friends and family and start making money. The last thing you want to do in your first 30 days is weigh yourself down with non-revenue producing activities.
Buying Create-A-Book books and related products from Create-A-Book, Inc. for resale is considered to be a business. So, if you intend to sell these products for a profit you will be "running a business activity" according to the IRS and other controlling agencies (like the town and state you live in).
We cannot give legal or accounting advice. But I will share some thoughts with you that might be a good start for you to consider. Many people run their business activities under a corporation. You can create your own corporation online, but you can also have an attorney start one for you. One benefit of having your business activities conducted within a corporation, is that if there is a lawsuit, there is a good chance that your obligations to pay damages will be confined to the corporation (you won't lose your house). There are exceptions to this so see an attorney for proper advice here. Choose a type of corporation (subchapter S, chapter C, charity 501c3, LLC, etc). There may be shares of stock involved. There may be investors.
Many people don't incorporate. They just get a business license and operate as a sole proprietor. Do your research to see what form of business fits you best. You may be doing this on your own, or you may set up a partnership. You may have agreements for this.
In all cases, it is a good idea to open a separate checking account, in the name of the business.. Don't mingle personal money with the business money. Keep track of all expenses in a journal. Use a CPA for advice on setting up your business and your accounts. Have your tax reports prepared and filed each year. Get a sales tax license from your state if necessary and file those reports on time too. It's not hard to do these things, but it is easy to overlook these items and that will get you in hot water. The fines can be more than the tax you owe. If you don't like record keeping, hire help. Learn Quickbooks and let your CPA or accountant help you get set up. If you have never done this before, consider the money spent to set this all up just a cost of business (like taking a college course for credits). What you learn here can be used for any future business too, so it's worth it.
The above is for you to consider, to "google" and learn about, and to then select a professional or two to help you with these legal and accounting matters. Don't attempt to do all the above things on your own if you don't know what you are doing and don't rely on the above information as being legal advice or accounting advice for which to follow.