Thumbnail on start page

Hi, I would like to have a thumbnail of the feature image of each post on my home page with a teaser text on the right side of the thumbnail. It should look a bit like this, but the picture can be a bit smaller: http://barefootinvestor.com/finance-news-money-tips/all-posts/ On my site I've got a small rectangular photo on the top of the teaser. It took me a while to work this one out, but I would like a square image left of the teaser. My site: http://www.aussiebuschleben.net/ Any help would be much appreciated. Irina