Command & Conquer Generals

Hi I found my old games I played years ago (Now 58 Years old) I lost disk 1 of my Command & Conquer Generals .

I have my original cases and disk 2 With disk 1 and 2 of  Zero hour. The license or purchase key is still attached to my cd covers.

How can I install or where do I get disk 1.Please reply wally style as simple as you can.

Thanks