I want to get into electronics repairs.how can I start?

So I have been talking to one of my friends and he mentioned how he sold his broken iphone 4 with a cracked screen to someone and the guy fixed it and sold it making a few bucks out of it. I'm wondering if there's any way I could learn how to fix electronics (such as an xbox, ps3, phones, tablets etc) and if there are good places to go buy some broken electronics to fix.

Do any of you have experience in doing this as a full time or a side job?

You can try to buy some broken ps3, Xbox or Wii on Craiglist or Ebay. With these guides, you will learn to easily fix common errors:

For PS3: http://playstation3problems.com/HotProduct

For Xbox: http://playstation3problems.com/Xbox

For Wii: http://playstation3problems.com/Wii