The sizes you have provided, is in Width (first) x Height or Height (first) x Width format?

Sorry for the confusion the sizes are listed below.

600 w x 100 h
120 w x 500 h
600 w x 200 h

One more question, same design to be resized in all 3 sizes or unique designs in all sizes?

Width is listed first.

You didn't get my question, i am asking should i design one single banner and then resize them according to 3 sizes you mentioned OR should i design all three banner with different design style in each of them

We are open to different options. If you can make the same ad work for all sizes that is fine or you can do unique designs for all.

If you want unique designs for all, so you'll have to increase the amount a bit, if that isn't a good idea, i can resize the same design for all sizes :)

Whatever way you want to submit is fine I am leaving that up to each designer. Thanks!

can you please add some images and logo that can go into the banner?

Please pull images to use from our website:
Our websites are listed in the brief.
Manufacturers we represent as well as the products we sell can be found on the first website.