Implement YSlow Recommendations

My site is built using wordpress. I have installed W3 Total Cache. Grade C Overall performance score 75 Ruleset applied: YSlow(V2) I wish to make the following page speed changes to my site: 1. Make Fewer HTTP requests This page has 6 external Javascript scripts. Try combining them into one. This page has 6 external stylesheets. Try combining them into one. This page has 11 external background images. Try combining them with CSS sprites. 2. Set up Expires headers properly in W3 total cache (This must not break functionality of the dynamic components of the site) There are 21 static components without a far-future expiration date. 3. Get GZIP compression working properly in W3 Total Cache There are 9 plain text components that should be sent compressed 4. Require advice on whether a CDN network is necessary for my site as well as a basic comparison of the CDNs available and which one you would recommend to go for. Freelancer Requirements: A. Excellent level of English B. SKYPE Depending on the effectiveness of this project, freelancer will be commissioned for other projects also.