Are you having a hard time making money in runescape? or do you want to make more? Mining and smithing can be very profitable and all you need to start is a pickaxe.
With a pickaxe you can start mining and earning gold. Find a mine with iron and coal. With the iron and coal you can create steel bars, these can be worth 500-1000 gold each on the Grand Exchange.
You can take the materials from mining to a forge. After you’ve finished the Dwarf Cannon Quest you can make Cannonballs. To do this you need smithing at level 35 and mining at 30. This can be very profitable and you can make millions.