Wahaha. You guys darem.
Look for holes in the sand. These could be prawn holes or worm holes.
If you knee deep or deeper, feel for softer type of sand. These spots are favoured by prawn and worm.
Then follow advice below.
1. Insert pump into hole. As you insert make the first pull. 2. Take out pump and squirt sand in a net/tube.
3. Insert pump in same hole and repeat.
4. You might have to repeat thrice before you get the worm.
5. If not. Bend down and start scratching around in that hole. Feel for the worm. You might find it.
When you find some(only 5 allowed) keep the rest for me. Btw you can't sell worms
Good luck.