I am not aware of any password during this quest. Any information required during a quest is normally either given during the quest itself, or it can be figured out by the player. It may also help to search some online guides, for some of the more difficult aspects of the quests.
Depends what bit your on.
Completing the "Tree Gnome Village" quest will allow you to talk to and use the Spirit Tree's that are placed around Runescape, whilst doing the "Grand Tree" quest will allow you to use the gliders.
Monkey Madness is a quest installment in the gnomish storyline. It is a sequel to "The Grand Tree". The quest is set on the Ape Atoll, which is an island inhabited by unfriendly monkeys.
This is a rather long topic; you may want to consult an online guide, for example, runescape.wikia.com, which has guides for all the quests.
Pretty far to the west. Look it up in the world map (click on the map icon, close to the minimap). Since you probably didn't do the Grand Tree quest yet, one way you can get closer to it is with an Ardougne teleport.
in runescape you can find swamp toads in the swamp northwest of the grand tree (Tree Gnome Strong Hold).
Use a herring on the grand tree.
hes in the center of the maze
Probably the Grand Tree mine, but you need to do the Grand Tree quest to acess this areaFor free players, I would say, the clay mine south-west of Varrock. A Varrock teleport helps you save some time, in one direction.
Far to the west. Look it up in the world map.
To find swamp toads in Runescape you will need to go to swamp, Northwest of the grand tree (Tree Gnome Strong Hold).
200gp around that. You can also buy it at The Grand Tree.