Making a Robot from scratch?

I want to make a programmable Robot scratch (NO KITS), i want to program it in C++ (i know some C++ so it will be easier if i do it in C++). So what i want to know is where can i get the main circuit board (is their a special name for the main circuit board) and i want to know the other stuff i might need. And i... show more I want to make a programmable Robot scratch (NO KITS), i want to program it in C++ (i know some C++ so it will be easier if i do it in C++). So what i want to know is where can i get the main circuit board (is their a special name for the main circuit board) and i want to know the other stuff i might need. And i was wondering if there is a tutorial online where i can make a Robot like i described above.Thx in advancde
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