How to list Inverts on MorphMarket?

Can someone give me some advice on how to list mealworms, dubias, superworms, and beetles? I have a ton of extras I don’t need and want to list them on here but don’t know whether I should ship by a certain number of worms or by a weight of worms in grams.
And would like to know how to package them for shopping and any tips you have for breeding mealworms, super worms, and dubias.