Alright this is a text copy of the steps I am currently on.
Flash Custom ROM
I.H.O CyanogenMod 7 ROM (Gingerbread)
6. Copy the unextracted ROM .zip that you wish to install to the /sdcard dir. Also if installing a CyanogenMod Gingerbread ROM, the unextracted gapps.zip also needs to be placed in the same dir to flash right after the ROM .zip.
7. Boot into Clockworkmod recovery mode (From powered off state, hold vol-down, home, and power button until the LG logo appears).
8. FIRST, BACKUP ORIGINAL ROM! Don't continue until this is successful. Use vol-up/down, camera, & back keys to navigate in recovery.
9. Wipe Data/Factory Reset, wipe cache partition. Under Advanced submenu, wipe dalvik-cache. Then uner Mounts & Storage submenu, format all partitions EXCEPT /sdcard.
10. Flash the custom ROM.zip from sdcard and gapps.zip too if going to a CyanogenMod ROM
11. Reboot and enjoy the new ROM, the first boot takes longer than usual, also some problems may disappear after rebooting.
Step 6 is where I am currently at. So I click that I.H.O Cyanogen Mod link that links me to another page where I can click on another link that takes me this
https://github.com/inferiorhumanorgans/android_device_lge_thunderc/wiki/Binary. I choose the first two and when I tried to flash one, it tells me on Flash Image Gui mod that the file is too big to be valid. I'm under the impression from reading step 6 that you flash the BACKside, then that gapps zip file. I hope that was more clear.