Display Help

Hi,
I just have a few little issues with the way products are being displayed in the marketplace.
1. How could I restrict the number of characters displayed for the title? I have set the hight of the grid for products, and if the product title is too long, it pushes the image and the product down and out of the box.
2. How would I set the size of the image that is used? I have some products with small images, most are perfect, and then some don't seem to be thumbnails at all. I have included a screenshot.
3. How would I use wp_title to set the name of the page? I haven't used the template to create a page, so the page doesn't have any title.
Thanks.