How do I have numeric input in a Gui?

I need to have a GUI where the user has a few input boxes with which they can enter values. They’ll press an update button and then those values will be passed into the variables to the different scripts I have. I’ve been able to add pictures to GUIs but don’t have any idea where to start on this. I’m pretty sure I can make the update button myself but I don’t know how to have input boxes and then transfer those values to the code. The ideal end would be to have slider bars I but if figure I’ll try to walk before running.

To anyone else w/ the same problems I found this.

http://unity3d.com/support/documentation/Components/GUI%20Scripting%20Guide.html