You can sell items at general shops or their specific shops (for selling to shopkeepers only). If you want to sell them to players, you can use the Grand Exchange! And also Grand Exchange (at Varrock) will find for you the best price you want and sell the item off though you might have to wait for a few days.
Not really :(
yes
At the same place where you buy most stuff: the Grand Exchange.
at walmart,gamestop and other well known card distributers.
i would say flyff maybe if you can download stuff.
yes, it is.
No.
www.runescape.com
Treasure Trails - Rune Scape Guides can be found at webpages like Rune Scape, Rune HQ, and Rune Scape Services and all explain how an individual can carry a clue scroll in the game.
dont be lazy, just do the math
Rune Wiki, its different each time.
The price constantly changes.