Going by my chart, what careers would I best be suited for?

I find many people choose careers ruled by their sun's house. Since your sun is in the 12th house, you would be very well suited to any of the Pisces related careers such as hospital work (eg medicine, nursing), chemist or anything to do with the chemical industry, film making, photography or writing. The 12th house is the most isolated of houses, so the career chosen is normally conducted behind the scenes or in isolation from others (eg writers who work on their own).