Runecrafting
To craft runes you must first complete the rune mysteries quest. Have Sedridor (or any of the other people who can teleport you) teleport you to the mining spot (you need a pick) mine rune essence when you are done use the portal to teleport back to wherever you teleported from. Now use the talisman to locate the mysterious runes for that type of rune (whatever talisman you are using). Once you find the mystirious runes use the talisman on the rune to teleport to the altar. Use your rune essence on the altar to make the runes. To get different talismans fight magical creatures like imps and wizards (men, guards and many other monsters also drop tailismans), they will eventually drop different talismans.
Level requirements to make different types of runes:

Free world runes                         Members runes
Air Runes : Lvl 1                        Cosmic Runes : Lvl 27
Mind Runes : Lvl 2                     Chaos Runes : Lvl 35
Water Runes : Lvl 5                    Nature Runes : Lvl 44
Earth Runes : Lvl 9                     Death Runes : Lvl 54
Fire Runes : Lvl 14                     Law Runes : Lvl 65
Body Runes : Lvl 20                   Blood Runes : Lvl 77
                                                   Soul Runes : Lvl 90
Locations talismans point to find mysterious runes:

Air Runes : Just south-west of Falidor
Mind Runes : North of falidor near the wilderness, you must take the                                upper cliff passage(not the passage to dorics)
Water Runes : Go just past the bridge to the wizards tower and go to the                           south-east(Lumbrdge swamps area).
Earth Runes : Go to the very top of Varrock (almost to the wilderness)                              then go east.
Fire Runes: Go to the Al Kharid desert and head to the middle of it.
Body Runes: Go just out of the west exit from Barbarian Village and head                       north.
*Cosmic Runes: Inside Zanaris (lost city), south of the cow pen in lost city,                           there's a long tunnel there, at the end is the cosmic altar.
*Chaos Runes: In level 9 wilderness, north of Edgeville, there is a large                                maze inside with the altar.
*Nature Runes: North of Shilo village.
*Death Runes: Not yet available
*Law Runes: Not yet available
*Blood Runes: Not yet available
*Soul Runes: Not yet available
XP that Making each rune gives

Air Runes : 5 Xp
Mind Runes : 5.5 Xp
Water Runes : 6 Xp
Earth Runes : 6.5 Xp
Fire Runes : 7 Xp
Body Runes : 7.5 Xp
*Cosmic Runes : 8 Xp
*Chaos Runes : 8.5 Xp
*Nature Runes : 9 Xp
*Death Runes : 9.5 Xp
*Law Runes : 10 Xp
*Blood Runes : 10.5 Xp
*Soul Runes : 11 Xp
By the way...
...thanks to Fiendish Imp
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