Need Suggestion for an E-commerce Coupon Site

Hi Guys
I wanted to create an E-commerce coupon based website, but I’m confuse which platform should I use, like I want to have my website SEO optimized and I may pay one time for any platform to do all the work. Like SEO plugins should be free. Plus can you guys suggest me a better platform, should I go for open card, WordPress, Jumla and if I purchase a wordpress theme then do I need to give it to a developer to code it or it is all ready I can change the content and pics and make it live, or how can I get an amazing website??
Need your replies thanks.

EDIT: Actually, better version:

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