I am trying to learn how to design a high quality website using Wordpress, and of course I am using the free version of it. So, does that mean when I decide to start building websites for clients, I would have to GO PREMIUM, to get access to more themes and features? though, I've found tons of themes but they are all plugins and even after I download them, I still do not have a clue on how to put the themes to use. What do I do here? do I pay to go premium?