Something like this is all you need. Don't buy anything that has a float on it. They just get tangled in the box. Also don't buy the fancy clips, they come off.
You probably don't need a beam but a compact scale would be handy.
Just get a non clear, reinforced weigh bag. You will be shocked at how many pounds you can put in a standard lay flat bag. When you put water in them the mouth will open.
As a Co, be mindful of how much gear you bring on board. If you can't get it done with 4 rods and a small tackle bag then you are not prepared and probably will not catch much anyway.
A spiderwire sling backpack is all I use as a CO.
Arti-FISH-ial Entertainment. FDx Custom Rods. CPFLURES.COM