Questions about items!

[GOD GUNDAM]

1.Is there an item list on the internet that show all of the items in the game and their functions?
2.How do you know which items to sell or not to sell?

[Dell]

1. I don't think so.
2. Easy, people look at the strategy guide. Or from people who have spent a lot of time searching for it just to help FFXII player. Love them!
What you shouldn't sell is Teleport Stone, Gysahl Greens, Great Serpentskin and Black Orb. And some of the items required for strong weapon/armor.

[vorpal blade]

1. Perhaps not online, but the walkthrough does.
2. You should sell almost all of your loot. To be safe, don't sell it unless it's dropped from a normal creature (I keep the rewards from marks and bosses as trophies until I get more than one).

[GOD GUNDAM]

What items can you use? Since I can't use rat pelt, earth stone, and etc... Do they even have a function at all, beside selling it?