if you go to the rom/kernel sticky of this forum, you can get both the rom and kernel. also cm7 is an aosp rom so you will need to flash the gapps file as well. this is so you can get all of the google apps like the matket and gmail. it is in the rom/kernel sticky as well.
just make sure that you use an aosp kernel. and tiamat has given the most consistent battery life for many users. usually with kernels results will vary. but the tiamat is an awesome kernel.
for cm7 wipe at least dalvik cache, cache, and data then flash the rom and the gapps file in the same recovery. after that boot your phone up. once you get set up, then you can flash the kernel.all you have to do is wipe only dalvik cache and cache and flash the kernel.