Print materials are a great way to assist with sales and marketing efforts.
Print collateral can include business cards, brochures and any other printed material needed to further either your brand recognition, sales efforts or internal training or processes.
The biggest consideration aside from clarity and quality is consistency. All of your materials should work together, be cohesive, share a brand standard as per your brand standard document and all work towards a common goal. Those goals can be multifaceted, but should all accurately represent you as a company.