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By exploring or you could find a seed that spawns you in a swamp biome.
Go to the map and click on the box on top of the snake and you will find the swamp and chooey jr.
It is in the Lumbridge swamp.
Unless you have mods, It is difficult to create biomes (for example, a forest, swamp, desert, etc). Swamps have a different shaded block for dirt, and it isn't possible to get that shade in other biomes. The easiest way to get a swamp is to walk around and find one. Use creative mode, if you have it. If you need to have a swamp nearby another area, use command blocks to teleport you to the swamp and back.
Anywhere you can net fish, you can bait fish with a fishing rod, too. That includes the Lumby swamp (at the river), Draynor (at the ocean), Karamaja (on the docks), and the Lumby Pond.