There is a heap of reading from the blogs on this site ... how much have you done? Chris Scotts book 'advnture motorcycling handbook' (IIRC) does a good job of world summay ... See South Asia forum for more stuff... You'll also want to look at 'what bike', 'Yamaha' forums .. you can always get the seat fixed .. luggage and fuel range and longevity are your problems on the WR..
Camping in Asia .. you may find it chaep enough to hotel it .. cheap local type hotels ... When you hit turkey then change to camping ...
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S