Some operators with C206 will need 500 hours for command, so will often start a new pilot at 250 hours if they are Tanzanian citizen, for command on the C208 the minimum is 1000 or 1500 hours depending on the operators insurance.
A few operators have cadet or copilot programs, the main ones are TFC (cadets, will work in the office when not flying) Northern Air (Copilots, 2 crew operation, also work in office when not flying) Regional air (twin otter copilot) and Air Excel (Let 410 copilot)
The main requirements for all will be a valid CPL and IR, without an IR no one is going to get work. Operators are businesses so paying for an IR is not part of their plan, get it first.
Many of the current group seem to be unwilling to start out on the C206, they are only willing to fly Caravan and bigger so they will not get work until they get hours! finally for getting a job in TZ, go talk to operators and please be smartly dressed when you do, shorts and a t-shirt wont get you a job!