What phone are you trying to put cm7 on? First you need to be rooted then head over to cyanogenmod.com and find your phone model then download the rom. Then reboot into clockworkmod wipe data, cache and dalvik and then flash over cm7. Since its ur first time you need to flash the gapps too. This consist of market Gmail etc... and if u want flash a custom kernel for better performance and battery life.
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