Welcome,
The best advice i can give you is just learn as much as you can there lots of good resource online.
This site is full of useful links as well helpful people. If you have no experience it depends what you are into more.
Linux
Python or perl
PHP,HTML,mySQL web apps
networks
protocols
There are lots resources on my site that are aimed at new people to security.
http://www.jamierougive.co.uk/ I have also just posted something i wrote in the options thread of how I went from pc engineer to junior pen tester that maybe useful too.
AS far as course go there are many out there it really does depend on how much you want to learn and how much you want to pay. I think a good key here is learning but having a good understanding too.
I have only done hackingdojo and I like it find it useful there is big lab to mess about in. There are also other good courses that I am sure other can let you know more about.