get a weapon and kill chaos druids for lots of herbs.. once you have lots of them (like after a week or so of collecting) find out which pile of herbs in ranarrs.. identify those then sell them for i guess 6.5k-7k ea? then sell the unid herbs you have left for 1k-1.3k ea just suggesting this because you said you dont have the capacity to merch :P not sure if your f2p so if you are just ignore this lol (if you said you were i completely missed it)
good luck :) if i went for a 99 skill it would probably be fishing lol..mainly because half the people at trees are annoying and there is tons more people at fish guild to talk to