Haha xD
You should follow some tutorials and build a FG grinding deck first.
Here's a good one for beginners since you only need to upgrade 6 cards:
5lk 5lk 5lk 5lk 7jp 7jp 7jp 7jp 7jp 7jp 7jq 7jq 808 808 808 808 808 808 808 808 808 80e 80e 80e 80i 80i 80i 80i 80i 80i
Photons->Ray of Light(RoL)
Grinding FGs is the best source of making money, so this is definitely something you should consider.
Oh and a FG is a False God, the level 6 AI.