It takes time to rank in Google but its way more than just an SEO plugin. You need to make sure the plugin is set up correctly and uses the correct types of data. It also depends how the website is created in terms of page structure etc. Then you start looking at social media connections, content, back links, etc. Are you paying for Google ranking? Keywords?
Bottom line it takes time, effort etc. Just Google SEO optimisation tips
Your best bet would be to develop a website that you want to sell on here. Once that is finished post a link here and people can advise you if it is good enough and how to submit it.
I do not know much about Eclipse but if it can ONLY be edited using Eclipse as opposed to any HTML CSS etc editor then it won’t be accepted as that makes it a dedicated platform which is not a category on here
I am confused the link you referenced: http://themeforest.net/item/black-label-fullscreen-video-image-background/336949 is a WordPress theme i.e. free CMS and it also has a shop built into the theme?