You may want to pick a different field then, the pay is shit compared to the stress with alarms. Ive made 200-300$ on the side working less than 10 hours a week just doing car audio, it varies though. My cars pretty loud inside and outside plus its an old school "box" style car so it seems to get attention and bring me business. I dont touch alarms or anything. When circuit city went out of business i bought all their dash kits/wiring harnesses/amp kits so i usually do pretty good deals on installs plus i have all the materials.