Why not just air-run like the rest of f2p lol
But seriously, you get like 100k an hour.
You just go to the air altar as normal, and you see people saying "8x -name- "
That means ur getting 8x ur ess, so you req assist them, wait for it to say "-name- has assisted you" or whatever and craft the runes.
They get the experience and you keep the runes.
Hope this helps,
~Littlez