Computer Technician

I am a 32 year old man in the construction industry but, very interested in computers. I have been learning hands on for 3 years now but, mostly what I have been learning has been rebuilding my own computers. The more I learn the more I want to know. So this brings me to the subject of this letter. I would like some advice on which route to take in the computer industry. I am not very familiar with what areas are even out there or what areas are projected to be the hot fields in years to come. Would you recommend a technical school or just dive in hands on and learn as I go with a company in my town?