Hi Proton Persona 2010, >4 year never refill gas or service,
1. The service need to take how long time
2. Normally what parts recommend to change
3. Pm price for full service
4. Current condition is good and cool just if after aircond on for some time then switch off compressor only fan on can have odor smell, but if never switch on aircond when start the car all the way only fan no such smell come out, probably the cooling coil get wet after compressor running that create odor smell. 
5. Dose my car aircond service need to take out dashboard sked later install back got many rattling sound (you know lah Proton)

Thanks