Magento customization

Magento is already set up and working properly. Template is free, modified by me and is perfect. I need: 1. Someone to explain me how to set up inventory so only certain sizes are available for purchase on each item. 2. Help set up featured item module 3. Help setting up java script slider on home page (I have the scripts - from another magento template) 4. Other modifications will follow, so it could be a lucrative business for the right person. I prefer someone located in NY area, professional and specializing in Magento and ecommerce. I will not deal with companies, just individuals. No smokers, no idiots.