If you are confused about how to install ROMs, then you most likely do not have 2.1. There is a difference between having 2.1 and simply being rooted.
Next... there is a LOT you are missing. you don't just simply put ZIP files on your card and have them work like magic. You need a custom recovery image, then you need a nandroid folder, then you need to unzip the file and place the various files inside in their respective locations, then you need to go into nandroid and wipe system, data, cache, then you need to install. See how much you are missing?
I would suggest that before you do anything horribly bad to your phone, you take a peek at the sticky at the top of this subforum and do a LOT of reading.
Bricked phones make me a saaaaaaaad panda.