Your business plan should include your profit sharing plans and profit sharing agreement. You should have targeted commission levels and plans on how to grow your affiliate base. It is also valuable to include a mission statement and a marketing plan.
Focus your efforts on those products that make you the highest profit. Once you've written your plan, don't just set it on a shelf. Pull it out once a year and review it. Are you on target with your goals? What needs adjusting? Have business expectations changed? Update the plan each year.