okay just a quick explanation.
three levels of clues
level 1:(1-16)
Best monster to get from: Rock Crabs, Goblins, Pickpocketing H.A.M. Members.
level 2:(21-74)
Best monsters to get from: Guards, Ice Warriors.
level 3:(76-276)
Best monsters to get from: Jellies, Hell Hounds. Just a note most dragons drop these, and so do greater demons.
Rewards Level 1: Black Trimmed Armor, (t) & (g). Wizard Robes Trimmed (t) & (g) plus Elegant Clothing and Vestments Robes
Level 2: Adamant Trimmed Armor (t) & (g). boaters, and Black and White Elegant clothing. plus Cape and Hat of the Vestment Robes
Level 3: Rune trimmed armor, (t) & (g) Zamorak, Saradomin, Guthix and Gilded, Cavaliers and Robin Hood. Plus Crozier and Miter (Staff, Ammy) of Vestments
Here is a full list of rewards Any more information u need on clues why not try using a Fan Site? like Tip.it, or runehq.com they have the answers to the clues making it go alot quicker.