Iam ERP-Manufacturing consultant,
if you look to be professionsl in your field, I advise you - as best bractise- to begin with the following point:
1- Build Master items List.
2- Build BOM for each product.
3- Build Routing file for each level in BOM for ach product.
4- Design your manufacturing process.
5- Build MRP system to control your production and MMS to control your maintenance activities.
if you interested to konw more don't hesitate to contact me,