You bring them to any rune alter. If you wish to keep the prior colour of the guardian, bring it to it's previous alter.
You need to complete the Rune Mechanics quest.
The maker of Runescape by the name of Andrew. Rune is a made-up material that is ONLY used in runescape
Rune Pickaxe - 18,145gp - 20,055gp
Rune berserker no question. Rune Spike is worst, 2nd is rune kite, and best is rune berskerker.
Mithril, possibly Rune (rune is a sort of greeny-blue)
You use rune essence/pure essence on a altar. (runecrafting)
Rune Med-Helmet.
summoning
none
The current market price for rune bar is: 18,905 - 20,895
saradomin shield
rune-scape not very hard