You will probably make very little in your first couple years if you plan on building something meaningful. There are ways to take home money in your first year, but I believe if you are trying to create a long term successful agency, you need to reinvest your money early, in the first 1-2 years. That requires paying yourself very little money. You must invest your money into lead generation, structural and management systems, automating/retaining customers, hiring employees, nurturing referral partnerships, etc.
When I first launched my agency, I sold about $10,000-15,000 dollars in premium, not commission, in my first two months. That comes out to about $1,500 in commission in my first two months. It took me about three months to get a real carrier that was competitive and worked to get people to buy their services. At the end of my first year I sold about $250,000 in premium and now that I am approaching my third year, we are consistently $30,000-50,000 a month.