Making money on a pure is extremely hard. You're really a glorified skiller, because PKing will make you very little profits, and the PvM you can do is very limited. With that being said, a lot of raw materials are very profitable right now. You just need patience and persistence to get a huge quantity of these commodities.
If you train a multitude of stats, you can gain even more profit. For example:
Mining, Smithing and Fletching
1. Mine
Iron Ore and use them on a furnace to turn them into
Iron Bars (use
Ring of Forgings to get a 100% success rate of forging iron bars from iron ore - you get 140 uses from the ring).
Tip said:
Al-Kharid is an ideal location to do this, as the proximity from the mining area to obtain the iron ore to the bank and from the bank to the furnace is relatively close.
2. Use your
Iron Bars on an
anvil to make
Iron Arrowtips per bar.
Tip said:
A good location to do this would be at West Varrock - the bank is right across the street from two anvils, making it very convenient.
3, 4. Cut
logs and use a
knife on the logs to make
Arrow Shafts. Use
feathers on the
Arrow Shafts to make
Headless Arrows.
Tip said:
Lumbridge is good location for steps 3 and 4, as you are close to a chicken farm to get the feathers necessary for the arrow shafts - and you are surrounded by basic trees to get the logs to make the arrow shafts.
5. Use your
Iron Arrowtips on the
Headless Arrowheads to make
Iron Arrows, go to
World 301 or 302 at West Varrock by the Anvil you were at in
Step 2, and sell your
Iron Arrows for anywhere from
20-35 gp ea.
That's just an example of a very basic skill to make money! It is
extremely tedious (and I mean you will be bored out of your skull), so I'd suggest finding a FC you can join or have some friends to talk to so you don't die of boredom - but you will make money off it.
Anyways, wish you the best.