Amiga was originally made by Commadore right?
No, but commodore made them.
Can you attach Amiga 3.5 drive to a Commadore 64?
With ducktape you can. But it will not work. If you want to go 3.5 inch on a commodore 8 bit you'll need an 1581 or a CMD drive. You are not likely to run into either of those. They are rare and expensive.
I have old style 84 puter game for commadore want to run it faster and better on the Amiga
No,no,no! Amiga and 8 bit commodores are in no way compatible. Forget it. Buy a nice beefy pc and install the ccs64 emulator. That emulator will give you a GHz C64 :-P
Try browsing the web some more. There is a huge ammount of info on these different computers.
Good luck.