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Hello mate, My advice is that the product descriptions and information in text are original content. If the text copied from the manufacturer's website appears on your website, google will penalize impacting well on your positions. Note that surely many of your competitors websites have descriptions and information copied from the manufacturer's website, it is a common practice. If you want to be different from your competition you have to make own original content. I can tell you from experience that also have an online shop, all my items are original descriptions made by me, so I got in just 6 months to live my website get good positions in top10 positions mainly related to the brand. Youtube upload videos is also important for your SEO. The important thing is that descarges videos and upload it to your YouTube channel, I always get on google + and immediately to the web, so you can write your own aspects that also influence the seo as the title meta and keywords.