Question I made a speed hack , but it doesn't work?

What did i do wrong ,
DWORD SF =(DWORD)GETMODULEHANDLE("UGGunz.exe");
DWORD Speed = SF + ;

DWORD WINAPI Speedhack(void*)
{
while(true)
{
( *(Pbyte)(Speed)) = 0;
Sleep(100);
}

Bool APIENTRY DLLMain(HMODULE hm, DWORD rr, DWORD re)
{
if (rr ** DLL_PROCESS_ ATTACH)
CreateThread(0, 0, Speedhack, 0, 0, 0,);
}


One question How do i Find the game speed? I looked at various cheat engine tutorials,but Idk how to find the game speed. I can find the health , ammo , and so on but not the game speed I guess I need that too change the DWORD speed = SF + (insert game speed) I'm guessing thats whats needed , also Can someone explain too me what each coding in my code means , i'm trying to fully understand it. Also how would I be able to adjust the speed. to slightly slow it down If people read this can i private message you and ask for more help. one more question it wont let me private message anyone.

You actually have to hook a function. I think it was GetTickCount, you have to return the modified tick value.
GetTickCount
That's the msdn page for GetTickCount, you have to google how to hook.