I want to modificate a Linux distro but i haven't knowledge for this.
What i want to do is put it in a machine and let it in a public place. It should have keyboard so people can type the things as they want. But i cant allow shortcuts, terminal or tty to be opened by this keyboard. I am thinking about 2 keyboards with different permissions. To the mouse my idea is touchscreen.I should also make a good gui so it can be more pleasant to the people. And as the idea grows i want to add more features. But i really lack knowledge to do so. Could someone give me tips of books to guide me trough this path?

What you want to do is known as 'kiosk' mode, try searching for that on google and distrowatch, I beleive a couple of distros allow running in this mode

Porteus has a kiosk version:
http://porteus-kiosk.org/index.html

I forget the name of one distro that is set for a kiosk mode already. (webconverger?) Maybe from asia. They also offer versions for your branded company or location.