Fishing

This is a great way to make money when you first start the game on
nearly any server. To fish, you must first buy a fishing pole from an NPC or player.
Once you've bought this, equip this in your weapon spot by clicking on it
in your inventory and clicking the 'equip' command. Once you have equipped the
pole, attack the water using the TAB button on your keyboard. As you fish, you'll
sometimes see a fish come to the water's surface. Pick the fish up by hitting the
CTRL button or clicking on it with your mouse.

You will notice you get different fish as your level increases:
Level 1-19 ~Raw Fish
Level 20-39 ~Trout
Level 40-59 ~Catfish
Level 60-79 ~Swordfish
Level 80-100 ~Squid