Hi tailingloop
Nearest to you is obviously the Fleet


.....heading towards Newton Stewart is the Palnure Burn.....Newton Stewart itself has the Cree running through it then a liittle further you will find the Bladnoch.
For the Bladnoch, Cree and Palnure ring Jonathan Haley 01671830471....he has acess to all three.(has cottages actually on the banks of the Bladnoch)
Jim Stewart is handy too 01988402390for the Bladnoch and Tarff and also a small loch if the river isn't playing ball.
Alternatively there are two tackle shops in Newton Stewart who will have access to different beats/rivers etc.
You will have to stress trout fishing though as they are all really geared up for the 'Silver Tourists'
Sorry but no info on the Fleet water.....ask in the tackle shop
This will give you a starting point anyway