Can't you read? Hes f2p that means to Can't merchant guthans, durr. Anyways, I'd say merchant...full runes, buy in world 1, 3, 4, 6, 7, 8 for 175kea-185kea then sell for 200kea in varrock bank in worlds with pop of 1800-1900 people, if your good you can do 10+ at once, very good cash, only if your good at it. Give it a try, see if your good at it :