Ad space widget

Hi Sakin, I am working on the sidebar for www.iwritegreatcopy.com. Could you clarify: 1. Catch ad space widget. If I want this widget to appear on each page and post, would I place this in the main menu or do I have to specify page or post and home page separately? 2. Can I specify the page or post that the ad will appear with catch ad space widget? I see space for image (ad) and url (link to advertiser). If I want ad on a specific page, do I have to treat ads as featured images to get it onthe page I want? 3. If I want to place a dummy ad so potential clients can view size and placement, could I do this using this widget or is this widget for placement only? I have noticed that wordpress has some plugins which will allow for this. Any suggestions on a plugin which would work with your ad space widget? Thanks for any clarification you can give. Karin