Now that free trade is back fishing isn't the best way to make cash... Even wc is good money but to slow! Try Hunting, so far i've found it the best way to make cash on runescape! Sell for 5%-10% less than mid price for the best sell and im making 32k+ a load. (load is 5-10min
A good way to make cash is by hunting! To start hunting catch birds found south of Castle wars and south east of the ogre's. The picture below is where you can find Swamp lizards!!!!!!!!! bring a small fish net and a rope (depending on your hunting level) Enjoy!