I'll be happy to help you learn how to work with fiberglass, but for future reference you'll get better responses if you focus your questions better.
For example, creating a fiberglass dash is a HUGE and complex undertaking that is not for the weak of heart or the inexperienced. It would help to see photos of your current car, and perhaps a sketch of what you intend to do.
For the computer housing, again, it's different in every case (no pun intended!). You say you're planning on putting in a carputer... what kind? where do you intend to place it in the vehicle?
The other thing i strongly recommend is reading the stickies as well as searching the fabrication forum on topics you're interested in. There are alot of people walking the same line as you and you can learn from their successes and failures alike.
here are some links to get you started:
how to: make a factory bezel
Working with Foam
The thing to remember is not to focus so much on duplicating a project as learning the techniques employed.
Good luck on your project, and remember, specific questions will get you more responses and better answers!