Financially, there is no way to write a 'few' P&C policies. You'll lose money doing it.
A few health policies can be done, but P&C can't be, the expenses and time commitment are much larger, making it a requirement to carry enough to cover the expenses, which makes it a requirement to have a staff person to deal with the policy service issues, which means you have to have even more to cover the staff salary.
Some of the hurdles you'll have to cross is E&O insurance. For health, you'll pay $40 a month, for P&C, especially with commercial, you'll pay $350 a month.
Now, you'll need accord forms, agency management tools, etc, forget the office, figure you'll do everything, but you'll have an overhead of at least $600 a month (probably more).
Construction is certificate city, you'll have to be ready to creat certs on the fly. Doesn't take long, but wait till a project is put on hold due to a missing cert, not pretty. This is why you need someone to do these pretty quickly, though again, with a friend, hopefully he won't drop the ball in letting you know he needs one for work that is being done tomorrow.
I don't know about PA, but I'm sure you can find a
GA that will appoint you. Make sure you own the business if you decide to leave.
With commercial, you only need a few mid-size policies to pay the bills. It's a lot of work to go through for just a few policies though.
Dan