make a rectangle frame out of 1x2 wood.
"might float for a week or so,just put a rock on it,it will sink"
or use pvc "never done it that way".
cover it with window screen,metal screen works better for the hole.
staple it to the wood.
on one end cut an x in the middle and bend the tabs in.
on the other end,only staple one side,so it can open like a door "to get fish out".
then tie the other end of the door shut however you want.
tie a rope or strong string to the trap.then tie it to a rock,tree,bush.
bait it,i use bread.i just put a cucumber in mine,going for plecos.
i check mine every sunday,you can check yours sooner if wanted.
sometimes theres fish,sometimes not.
might get pics of mine this sunday.
good luck