Different approaches possible, depending on the details of your process. If I take the following hypothesis:

• Inventory management is not important for you
• Every wedding card batch is different
• You want to manage discussions, mockups, design documents on every job

One solution, the easieast one:

1. Install the modules mrp_jit, project, sale
2. Create a Project 'Wedding Cards Printing' with the following stages Procurements, Design, Printing, Delivery
3. Create a product 'Wedding Card' with: Make to Order, Manufacture, Service

Then, you should be able to perform the following process:

• Create a quotation for 50 Wedding Cards
• You get a task automatically in the Procurement stage of the project
• People responsible for the service manage the project
• When the task is closed (delivery), the Sale Order becomes automatically to invoice

One other solution would be to use the inventory management system and define chained locations: Design, Printing, Delivery...