Need business card and letterhead design for a new employee

We're bringing on a new employee and need to put together the same standard set of branded stationery that the rest of the team already has. The logo, brand colors and main typeface are already defined, but there's no formal style guide for how business cards or letterheads should be laid out, so some decisions — like how to arrange a multi-line job title and contact block on the card, or where to place company details on the letterhead — will be up to the designer, based on the materials we already use.

It's important that all four pieces — the business card, letterhead, envelope and folder — read as one cohesive set rather than files put together separately at different times. Everything should be delivered print-ready for a commercial printer: bleed marks included, CMYK color mode, and standard sizing for the card and a euro-format envelope. It would help if the designer could also prepare a slightly simplified version of the letterhead and card for quick in-office printing, in case we need to print one or two copies fast without sending anything to a print shop.

What the final set should include:
— business card, front and back, ready for lamination
— A4 letterhead template
— envelope with the logo and return address
— A4 folder with pockets for documents and a card slot
— editable source files plus print-ready PDFs