Hi Jaime
On a more helpful note, there are a number of good quality websites out there that already offer this service. The best one that I'm aware of is
http://www.experts-exchange.com (make sure you read the domain name as experts rather tham expert, otherwise it can mean something entirely different)!!
If you're really keen to start something like this, I would suggest focusing on a particular area of IT, and specialise in that area i.e. gaming hardware or a particular product like Windows Vista.
Don't be put off by what other people are already doing. Look at what they're doing and learn from them, and think of ways you could improve it.
Good luck with whatever you decide to do.
Dean