Kislak is one of 94 villages of 'Demirci' which is just on the north-eastern part of Manisa.
From south Marmara it's appx 140 km. You need to drive via Balıkesir, Bigadic and Sindirgi.
Some parts of University of Celal Bayar is in 'Demirci'. So I guess their phone number may be of help:
+90 236 462 38 15
For some more information regarding Manisa,Demirci and Kislak, here are some web sites to look at:
http://www.manisa.gov.tr
and
http://tr.wikipedia.org/wiki/Demirci,_Manisa
I assume you are Turkish (by the sound of your nick name). So I didn't mention that Manisa is very close to Izmir. In case you are living abroad or in a different city, just a brief info; it can be easier to take a plane to Izmir and then a bus from Izmir to Manisa. Or you can hire a car to drive from Izmir to Kislak. The roads should be alright...
Hope, this information helps...