1) Download Simple FS Dumper (latest is 0.41 or 42) and dump your NAND to SD Card.
2) Use SD card or USB loader is your chooise, if you want to use USB, then it need to be FAT32 and included the folders FS dumper put on your SD Card.
3) If you are happy, then download "showmiiwads", create the common key with it and download your VC games example. Make it "extract to NAND" (I created a folder I called "NAND" and tell showmiiwads to put them in there).
4) Since Im a lazy bastard, I use FTPii to copy over the folders to the root of my SD card from the NAND folder.
5) Start Triiforce or Triiforce MRC (I use MRC since Triiforce just code dump me)
6) Enjoy!