Tahir,
As Capt Mo, stated, do not limit yourself to Sydney, Jandakot Airport, Perth has a great number of flying schools that cater nicely for individuals such as yourself.
If i was to be spending money on flight training, Air Australia would be my choice, no i do not work for them, but i did obtain my Private Pilots Licence there, atleast for the inital to PPL/CPL.
For Instrument Rating i would head over to Johnson Aviation / Coastal Jet at Port Maquarie ( half way between Brisbane and Sydney, a number of airline fly into and out of that area ), I do not work for them either, but did my rating there in 1996.