Good. So you will need to put the rom and radio onto the SD card, I would suggest putting them in a folder where you will know where they are not the root of the SD.
Once you get them on the SD put it back in the phone and boot into recovery like I described above. From there you will use the volume rocker to navigate and the home soft key to select. Start with format data/factory reset, pick yes, and allow it to format the data.
Next choose wipe cache, pick yes, and allow it to clear all your cache,
next go to the advanced menu and choose wipe dalvik cache, pick yes, and allow it to wipe your dalvik cache
You can choose to go into partitions menu now and choose wipe /system but you do not have to, I usually don't
Now you need to flash the rom, to do this you will choose "apply update from SD" then "choose zip from SD" navigate to the folder where you stored the rom and choose to flash it, once it is done you need to reboot,
You will not have any signal once the phone boots up and it will take a little longer than normal to boot because this is the first boot after a rom install.