I am about to open a business in Sioux Falls, South Dakota. Should I just get my business going and then worry about legal issues later?

No. One of the worst pieces of advice given to South Dakota small business owners is to delay the "legal issues" until your business achieves a certain income. 

Delaying the "paperwork hassle" and "legal fees" may sound like good business strategy.  However, failing to incorporate could result in your personal liability for injuries or damages.  For instance, if your flower shop delivery driver accidentally hits a motorcyclist, there could be serious legal consequences.

Also, avoiding the "legal issues," such as forming a corporation or limited liability company (LLC), can result in expensive litigation to resolve later disputes about company structure, company ownership, and company profit distribution.