Suffocate

What I did was, 1-25 range I trained on primarily cows, but also other easy things. From 25-40 range I trained on ghosts in the Varrock sewer (go behind the piece of rubble and they can't hit you. Use the highest shortbow you can, and upgrade to Maple once you get 30 range. Training arrows don't matter much, I usually train with bronze or iron, because they are cheap. Then, if you want, at 35 or so you can train on the guards in Edgeville (shoot them through the gate). From 40 up range, train on anything you like, if you plan to go higher than 40 range. And from how my range account is going now, doing that has worked well. If you don't plan on pking with range, just buy iron or bronze arrows, or if you want, steel. Buying higher is a bit of a waste though unless you have money and you want to spend it lol.

You can find on some forums people who will buy for 40-50 gp each, that's rather rare though. Merchanting ess is a quick way for money, buy it 20k, sell it 30k, and keep doing that. Another quick way is to, athough rather time consuming, buy willows from general store thats very close to a bank (like Varrock is a good spot) and buy the willows out of there, with every space in your inventory but one (for money) open. Buy them, run and bank it, and keep doing it until the price gets over 20 gp each (probaby wont happen cos there's usually like 3k+ willows in a general store). Try to get around 1k of them, then go sell them for 30 each, which is around a 20k profit (about 17k). Although it does take time, it's pretty usefull when you're utterly low on money.