OK, you can install that by renaming it to update.zip, putting it into the root of you SD card, then using SPR to flash it.
Don't worry, you haven't bricked your phone. From your description I can assure you that everything will eventually be OK. It sounds to me that you used the procedure for rooting a phone with Android 2.1 on a phone with 2.2 installed. You aren't the first one, you won't be the last...
But it appears to me that you're in just a bit over your head. Maybe you should go and read up some more on rooting before you go too much further.
And if you need more help the Rescue Squad is here for you.