There are way to many variables to answer your question. For instance, you ask how many additional personel would be needed, without stating what you have currently. How many policies do you plan on writing?
Also, you neglected to say what type of P&C policies you would write. Airplanes? Skyscrapers? Commercial? Home & Auto? Yachts? It makes a difference.
Beyond that, the general rule of thumb, assuming personal lines P&C is needing a full time employee for every 400 to 1000 policies. I know it doesn't narrow it down much, it depends if you want to grow, doing marketing in house, have well trained people, good management systems, an effective agency management software, etc.
Dan
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