I have found with training people often get two things confused, learning the software & learning how to edit.
If you want to learn the software go to an authorized training center, your apple store my run these or a third party / school / university / training company. ( in the UK try
http://www.sohoeditors.com/SETmain.asp)
Learning to edit takes a little longer. You could try one of the following, go to film school / get a job at a production house, yes you will get all the jobs other people don't want to do / join a film club or make a short film with some friends.
Doing a real job such as a short film is an excellent way to improve your editing skills. But avoid offering to do wedding video they are a major pain to do especial if its family.