Flying in TZ
Hi there.
With your experience, you should go for precision air, they're the biggest operator here and they have ATR's, 737's.
Also you've got air tanzania with dash 8 etc..
as for the rest, it's only caravans and 206's. It pays 3500 usd for caravan.
My feeling don't waste your time with general aviation, go for the big ones, with your hours, you should score. An ATR raing would be of course a big plus.
Good luck.
Cheers.