Whether you want them bagging - good idea, not much more expensive, our doesn't like to vac pack lamb due to bones, means you can just unload to freezer, removes the food handling risk from you.
What you want in a bag - i usually say pack for a family of two as that covers different size leg steaks etc, and for mince max 500g approx.
Get it labelled as not all customers recognise joints, also comes withte required dates, source etc info., as well as weight, Again, not much more expensive.
I've posted my usual cutting list before. Depends what your customers like. Mine are mostly small families so I even have Hebs shoulders halved. Neck comes as is. Breast best minced (too fatty for many people).
If I get legs, or legs halved, the shanks are on them. It's only if I ask for leg steaks I'll get shanks seperate.
Best still, talk to the butcher at the abbatoir - they are really helpful.