You don't buy runescape gold, because that's against the rules (see real world trading on the site), and will likely get you banned.
you can eighter buy them from the mage shop near port Salem or go to the grand exchange
first u mine gold,then smelt about 5 gold bars then go to a smith shop and smith a gold full helm..................P.S its only for mems
13 years old.
Go to the hairdresser in Falador, he does it for free.
You go to the Rune Shop in Varrock, talk to the wizard, select the Teleport option, and you can mine as much Rune Essence as your inventory can hold.
go into a pvp/bh world.
you go to your frieds list and add someone you know
If you ever need help with Rune Scape go to Sals Realm Of Runescape. I have used it to beat many hard quests. I am a lvl 79.
you still can if you have the glitch noclip you can walk over water
On the main site go to account management and select change password.
anything rune, dragon, barrows, godswords ect.... id go rune schimmy for cheap, whip for expensive, or dragon skimmy for mid range
there are runite rocks in the mining guild and in wilderness.(go to mining guild but requires 45 dungeneering)safer.