can you post/upload images of samples with the design style you're looking for? kind regards

What size Postcard? 3.5x5 or 4.25x6?
These are both the standard first class mailing size.

Some inspirational images uploaded.  We haven''t decided on the postcard size but assume 3.5x5 and I can scale to 4.25x6 if necessary.  Thanks!

Sorry Im reading the brief again and you are mentioning about wanting the final file in Vector format (in Illustrator) so you can scale it down to flyer/poster scale.

How big is the original size?

Also we are using photographic images for the flyer and it might make it difficult to vector. Your thoughts?