Customise a wordpress template / theme -- 2

I have a wordpress directory template that I like the look and feel of, but I don't like the functionality of the listings directory plugin. I want to create a business directory that uses posts and a combination of other plugins instead of a plugin that came with the theme, but use the same theme to present the directory. I also want to customise 3 different post templates based on 3 different custom post types. and finally I want the site to be; • Responsive • SEO Optimised • Mobile Friendly • Google Analytics options for every post • User Friendly experience • User Frienldy permalinks • Ability to import Data via CSV or XML • Ability to toggle on/off featured posts types