You can get law runes from the runecrafting skill at level 54, or from buying it at the grand exchange, The Mage Arena, The Magic Guild The Marim rune shop on Ape Atoll, or Ali Morrisane (after completing The Feud 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
F2P: Air rune Earth rune Fire rune Water rune Body rune Chaos rune Cosmic rune Death rune Law rune Mind rune Nature rune P2P: Dust rune Lava rune Mist rune Mud rune Smoke rune Steam rune Astral rune Blood rune Soul rune Extra: Rune Essence(F2P) Pure Essence(P2P) As you can see there is quite a few -Dd_rulez
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