What to do with Thin Content & Soft 404
 

I have an OpenCart custom screen printing Store. I blog there too and have some information pages. I've noticed that I have many soft 404's , which my google webmaster tools tells me that they are really just thin content pages. Is it better for me to tell google not to crawl/index/follow those pages for seo purposes? If so, what's the best way to do so?