Help with *.inp file creation for Abaqus

Hi, I am supposed to create a *.inp file to run on Abaqus to solve a truss problem; it is my first time using this software, and I don't know where to start. I don't know what is the difference between a model an the *.inp file!

Do I create the *.inp file on Notepad or WordPad then import it to Abaqus, or should I start creating the model on on Abaqus prior to create the *.inp file, and edit it? Anyone knows where can I look for a good sample problem of these kinds?

Any input will be greatly appreciated.

Thanks,