A business plan is definitely a good thing to have, along with goals that you would like to reach. Each year, or two, you will refine it. In insurance, you can get chargebacks which are normally unplanned unless you sold a policy that was questionable in the first place. There are so many variables on what your expenses could be that all that can really be provided is an estimate. (how many states will you be selling in, lines of authority, how often will you purchase leads, from who, which carriers will you sign up with, which states will you be appointed in, etc, etc). Make reasonable, reachable, and measurable goals. Such as, this year, I'll sell 10 policies for life insurance. Next year, I'll sell 20 and hire 2 agents. It's extremely important to start off focused on a specific market. For some ballpark numbers, plan on $250 for random (misc) stuff monthly, and 1,200 - 2,000 a month on leads depending on your purchase frequency and product.