Website Inventory Formatting/Programming

There are two tasks needed: (1) Format the layout of jewelry items on a e-commerce jewelry website. The site uses Drupal for the CMS. (a) The site was created with the jewelry items displayed 3 on a row and 4 rows down. I want to have 4 items displayed per row and 6 rows down. (b) The images/pictures of the jewelry are all different sizes. I want the pictures to be resized to be all the same size (width and height). Is there a way to set it up so that as inventory is uploaded that the defined sized can be hard coded into the site? ? (2) The Search functionality needs to be set up and mapped out.