If you have a partner in your business, be certain to have a buy-sell agreement in place. Often, this is funded with key man insurance. In the case of a pre-mature death, you would not want to suddenly be in business with their spouse.
Retirement plans come in many shapes and sizes, from the one person Uni(K) to a 401(K) or 403(B) plan for your employees. There are also SEP Plans and SIMPLE IRAs. Each plan has its advantages and best fit. A plan can be structured to provide you with substantial pre-tax savings to fund your retirement plan. A financial advisor can review your situation to determine the best fit for you and your company.