Alright,
First off are you F2p or P2p?
Second, you should post your stats because I dont
feel like looking them up.
Third...
A.) If you're a member I would suggest picking flax
and either selling that or spinning it into bowstring
and then selling that.
B.) If you're a F2p cowhides. Kill cows, and sell the
hides, that's usually a good bet.
Either that or train your combat up and fighting stronger
monsters. Goblins = fail.
I'd also suggest getting your Fishing, and Woodcutting up.
You can usually sell some fish at a good rate, if that fails,
cook it and use it yourself. Now, for Woodcutting. You
can either sell the logs, to fletch them into bows, and then
string them with bowstring, if you didnt sell it. Alch the bows
using HIGH ALCHEMY. Low Alchemy is crap.