How to output for Oculus GO

@imperativity  I admit I am frustrated and confused on 4 fronts right now, all relating to deploying a Unity build to the Oculus GO. 

1) Connecting my GO to a PC. 

1a) I've noticed the when I'm in developer mode, the GO does not ask if I want to allow the PC access to files. Should I be in Developer mode? If so, should it still ask me that question when I connect it to my PC? Is it a problem if I am not prompted with this question?

1b) I've installed the ADB driver (and also had previously had drivers installed automatically when plugging into USB). Regardless, my device rarely shows up in File Explorer. If I uninstall it through the device manager and keep plugging it into different USB ports, sometimes I get lucky. Do I need to see my GO in File Explorer?

2) Android Studio Setup

2a) This page (https://developer.oculus.com/documentation/mobilesdk/latest/concepts/mobile-studio-basics/) refers to "Mobile SDK VRSamples". It's not immediately obvious where to get that download. My best guess would be "Native Mobile" on the Downloads page, but that doesn't seem to have what I need. Where is the download?

2b) I don't understand how Android Studio comes into play. Do I need to use it? I'm used to developing in MonoDevelop (C#) for Unity. What am I using Android Studio for?

2c) Do I need to tell Unity where my Andriod SDK(s) are? How do I do that?

3) Signing Apps and OSIG

3a) I get I don't need and OSIG for GO. This page (https://developer.oculus.com/documentation/mobilesdk/latest/concepts/mobile-submission-sig-file) says "Unity automatically signs Android applications with a temporary debug certificate by default.". That's good enough for me to get a Hello World app running, right? 

4) My main problem is the documentation never walks me through building my app in Unity and testing it on the GO. I'm just looking for "Hello World". That's what I really need to know. Right now I'm just stuck. 

Thanks for taking the time to read this. I hope you can help.