Where to find help for beginners? Replacing website that uses old Concrete5 legacy version

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We have a site now that is using legacy version 5. I'm new and don't know much about building websites. From what I have read it might not be a good idea to just upgrade our current site to the latest Concrete5 version. So I'm looking for a way to use the latest Concrete5 version to create a New version of our website in hopes that I can bring this new version online and replace the old site and old Concrete5 legacy version. This soounds like a plan but I have no idea how to begin the process. Are there any good step by step instructions or videos on how to do this? Thanks