Do you have a "Lollipop.apk"?
If you're stock, you can download the OTA to your computer and sideload it with ADB. Firmware updates don't have APKs, they come in zip folders. APKs are for apps.
If you want to manually install Lollipop on your device you need a Lollipop installer file. Have you got that?
Yeah, there are a lot of guides out there. Here's one from Android Central: How to manually update your Nexus | Android CentralI have no idea what your talking about, any links, or tutorials? I know how to install things and that, but i just don't know what any of this means.