You should check out the Growth Hacking class at onemonth.com - I have taken the class and totally love it. It walks you through a full product launch from building a landing page, writing perfect copy to selling. Lots of great advice in there but it does cost $49 per month (and one month is honestly all you need). Also check out this startup community: https://startups.blnkk.com Lots of fellow founders sharing new products and getting feedback from the community.