Top wide banner is very good decision. Top-right is good one.

I find this topic cool,

I would have an ad on the top, both right and left hand sidebars and one at the footer allow you to have more places for people to advertise. and you make a little something as well.

Review your website to identify areas in which you wish to put ads. Prime spots on a page include the top 300 pixels of a page, as well as the top left-hand side of a page. The least viewed and least read areas of a web page include the bottom half of the page and the footer area.

You can find so many blogs containing ads and square types of them might seem cool to load on right sides of pages, at the top and you may add four blocks to your homepage. The ads would be seen by people who just look at your site.

While creating contents, you may add single ads to the beginning parts of your text paragraphs, right below titles and when people move down the pages, they would surely spot the graphics and probably making clicks on them.

I believe the more it blends in and is relevant to your website the more CTR you will get.

The adds should not be placed at bottom of the web page.
It should be at left, right side of the main block.