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How do I take in controls using KeyState()? What arguments do I pass in?

Is there another way to do controls?

int dbKeyState(int iScancode); will return an integer value that is either 1 or 0 . The integer iScancode is the ACSII scancode of the keys. it will return 1 if the key represented by iScancode is pressed, otherwise it will return 0.

you can also call void dbScancode(void); .. this function will return an integer value that represents the scancode of the key currently being pressed... so if you pressed A it would return 30 ... if you pressed B it would return 48 etc..

there are a number of ways you can code "controls" it would depend on what you are controlling and how you need it controlled... i mean, if its an aircraft you do it a certain way, if its a person, another way...

There are also commands inside GDK for reading other control devices other than the keyboard alone.. mouse, forcefeed joysticks etc...

What's an ASCII scancode? It's just a scancode.
All the values are available within DirectX as defines with a prefix of DIK_.

E.g.
DIK_W has the scancode for the letter W
DIK_UP has the scancode for the up key

Look in the DX header file dinput.h for the full list.