544426 Customize product home page and product detail prestashop

hi i have a website with prestashop template i need of 2 little fix: 1) i need to customize product in home page (windows) now i have template elegant green compatible 1.4 and i have 2 columns in windows of homegage i want edit this value to 3 columns and edit position of image and words 2) edit product page position of image and description of product i need of image more big and pop up gallery that not resize image i need of a developper that want work for other little fix and have a good experience with prestashop