Hello there. I am a qualified and professional designer of 15 years. In all this time I have been working within the print industry, either designing for print, or tidying up customer supplied work so that it is suitable for print.
Working in the print industry has made me accustomed to working quickly and efficiently.
This sounds like the kind of work that I do all the time, and I'm good at it. I am new to Freelancer, so I don't have a very strong prescence yet, but I can guarantee that you will be happy with my work.
For your Stationery I would produce a one or two proofs, within 24 hours, which would then be refined. I would ask you to select various elements that you like. For example, you may like the overall feel of one, but the colour's from another. I would then produce a second round of proofs. Again I would look to your feedback and produce from that a finalised design.
I work with Adobe Indesign so I can be flexible. Normally I send PDF files as they are standard for commercial print. Other file types are available on request.