Tin is a World of Warcraft mineral, that is gathered by miners for other professions. (Jewel Crafting, Black Smithing, selling to other players, Ect.) Tin vains spawn in preset locations in the level 12 to 25 player zones. When a player 'mines' a tin vain, they receive the raw ore and have a chance, depending on their current mining skill, to raise their skill higher. The vain itself, weather its copper, tin or gold will then despawn. Vains in Ashenvale (and the rest of the WoW world for that matter) are preset in random locations, and respawn every 10 to 20 mins. Your best bet for locating them is to turn on the mineral tracker that boarders the mini map in the top right of your screen.
The entrance is in southern ashenvale near the border with Stonetalon Mountains for the alliance, and for the horde it is near the border of The Northern Barrens and Ashenvale. You don't have to go there to queue to battle but you do need to go there to buy your honor pvp gear at lower levels.
A good place would be arathi highlands, or ashenvale. If you are in doubt, you can always check the breadcrumb boards in the capital cities to see where you should be.
it was discovered is ancient times and i dont know who descovered it
The Befouled Water Orb is an item that is dropped by Tidress in Ashenvale. It starts a quest, but you seem to have to have the quest Simmer Down Now. If you change factions with it in your inventory, you will receive a Solid Gold Cointhat you can vendor for 1 gold. Also, if you are alliance, you can not get the orb as the quest Simmer Down Now seems to be required for it to drop.
You can find some guides about World of Warcraft (WoW) mining from IGN's WoW Vault page, the WoW Wiki fan page, Exploring WoW, WoWhead, WoW-Professions, and Curse Guides.
I do not know, you still find people ah
One can find more information about Malygos on websites like WoW Wiki, Wikipedia, MMO Champion, WoW Scene, WoW Head, WoW Ace, Joy Stiq or Crusade Gaming.
First you need to use the Translocation Orb from Silvermoon to Undercity. From there, take a zeppelin ride to Orgrimmar. Traverse Orgrimmar and enter Azshara through the back entrance, and go west until you reach Ashenvale. Walk all the way north-west again until you reach Darkshore. Do realize that this will take you through level 10-12 zones (Azshara) and a level 18-24 zone (Ashenvale), so you might die a lot if you want to reach Darkshore at level 8.
One can find more information about the WOW guilds from numerous resources. One well known resource is the WOW wiki that provides detailed information on the guilds.
You can find plenty in the auction house.
Wow interface is good for beginner and curse is the website you use to find addons
One can find much information about it on the Internet. Some places one can find a WoW Fishing Guide are Wowhead, WoWWiki, ElsAnglin and Book of Warcraft.