Go to this page and scroll down to two poster examples I've designed for concerts.

http://my.montana.net/aliceflynn/graphics.html Click here

Both are sized about 11x17". I resized them when I put them up on my web site, but the
originals are the same size.
The vertical one had a tremendous amount of information that had to be included. DON'T write
a book and try to fit it on the poster! I was given the text to use and
I pulled it off, but most people are not going to stand there and read everything on the poster
so keep the information to the basics as much as possible.
Notice that the images used were eye catching.
If you are not experienced in graphic design, it may be best to find a designer to do it for you.
I used Adobe Illustrator and Photoshop for both of these. I had to manipulate the photos to
make them work with the type, putting a reverse white against the darker photo. I changed
the train from a black and white historic photo to a duotone.

Alice