Yes, you will need to know SSH commands in order to manage your server or upgrade it to FC3. I highly suggest you get an old computer and install linux on it, and just toy around - That can help a lot when trying to learn linux. There are numerous books about Linux that can help you learn the basics, as well. Did you get an unmanaged server? If so, you may want to hire a server administration company to handle tasks that you are not comfortable doing, such as securing the server, or doing anything if there are paying hosting clients on the server.