Hi welcome! Start here.
http://www.simplylightwave.com/movie...html?cat_id=23
Then after you do a few free tutorials look at some of the other ones and decide what it is you want to focus on Modeling or Texturing or Animation.
Mclaren and Stratocaster are awesome tutorials for modeling and texturing. The Caveman is great for modeling texturing and animation.
If you have any specific questions we are more than happy to help you.
Building a portfolio is something you will have to work on.
Asking for help is great its a start just be more specific.