Help to create a PDF read/write program in C#

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C#

PDF

Hello!

I need some with the code for a program.
The program req. is:

It has to be visual (buttons, forms and so on).
At the start the user can choose from a couple of categories (buttons).
When he has chosen a category he comes to a new form with sub-categories (same happens as before).
Finally when the user has come to the final sub-category there will be a menu or drop down list showing names of PDF-files he can click.
When he clicks one it will appear on the form.
He can also create new PDF-files and save them in a category of his choosing.

All can be done locally or in a local area network.
I have okay/good knowledge in C++ , I have done some c# projects but I lack object.or.

Could someone help me, or give me some info on how to start.

Thank you