I just want to make sure if there is a specific procedure i should follow before or when powering it up due to it being stored for such a long time in a most environment.
I don't know if it actually makes any difference but, for peace of mind, I run a dehumidifier in my shed/workshop and let any potentially damp gear dry out for a few days before powering-up.
Also, when I get hold of old TVs I blast them with an air compressor to remove all the dust before testing. Again, maybe it doesn't make any actual difference but feels satisfying to start with clean, dry equipment.