When I first started using Android, I went to youtube and watched videos for my phone, for top android apps, for unlocking and rooting, etc... Watching people do stuff on the phone was a great way to figure it out.
You also mentioned rooting. If you think that you might want to do this, you should do it now rather than later. When you unlock the bootloader, it will completely wipe your phone, leaving only the operating system. Any apps that you've downloaded, screens that you set up and files that you have copied to your virtual sd card will be gone. It's easy to do when the phone is new and you haven't invested a lot of time in setting it up. This complete wipe only happens the one time that you unlock the bootloader. Later on, if you decide to install custom ROMs, your sd card will remain as is. If you want to do it, here's a link to show you how:
http://forums.androidcentral.com/nexus-4-rooting-roms-hacks/224861-guide-nexus-4-unlock-root.html