FFXIII doesn't really require help. It's a fairly simple game. Perhaps with some bosses, or places to grind (which there aren't too many of) but that's about it.
If people want that, they can always just look up a guide online or use the official guide. Just saying. I mean, I guess if people really DO NEED or WANT help... then yeah, this thread could be for them. But seriously, FFXIII is so easy (but still awesome) that you can get through it without much trouble as long as you make sure to level up and stuff. As for treasure and bonus things. It's pretty obvious where the stuff is hidden anyway. Any side path usually has something of value, and when you get to Gran Pulse, it's still easy to do everything else. And yeah, if you really want help. Online guides and the official work well enough.
With collecting all items you're best making a check list and cross it off once you've got it. And I suggest you don't sell any accessories since a few of them you can only find in treasure spheres.