my favorite thing to do when i jump into an area i know very little about is read a dummies book https://www.amazon.com/Virtual-Augmented-Reality-Dummies-Computer/dp/1119481341
i think they are great books to set a foundation. You can look through the table of contents on amazon to get an idea of what it talks about.
I have searched for a headset and acquired the Chinese-made https://www.amazon.de/gp/product/B0187DR12G/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1. Be sure that your Moto X style is capable of running Google Cardboard first. You can test by downloading it. Next, check the size of your screen (normally indicated in inches). Then you can browse Amazon or any other online shop for some Cardboard. The next question you should answers, what do you want to use the VR headset for? Is it for gaming, occassional browsing, continues use? Before acquiring the Pasonomi, I had bought a cardboard with an elastic strap to fasten around my head. That was ok at first, however, the cardboard was not robust enough. After some travelling the device was obsolete. On top of that, I lost the magnetic NFC button. In general, the NFC button did NOT work, so if you want to use your phone with games, then you are better off purchasing a Bluetooth controller (I bought mine also on Amazon: https://www.amazon.de/gp/product/B01E3PTTOU/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1). It is cheap but works. Of course you can find more expensive, more sophisticated hardware, but I just wanted to test the experience. Three aspects I found very important on the headset are: adjustable headstrap, adjusting the eye distance to the lenses and the lateral distance between the lenses. Not all headsets offer the latter two, particularly the cheap cardboard viewers.
Hope this helped.
You can purchase a cheaper VR headset for your Iphone from my store https://elephantelectronics.com/products/virtual-reality-headset.
It's the same as this one on amazon: http://www.amazon.com/AmanStino-Smartphones-Adjustable-Distance-Controller/dp/B01ALKYBMG/
Thoughts:
1) You can remote view your desktop with teamviewer on ipad. Pretty sure you can do that with android: https://play.google.com/store/apps/details?id=com.teamviewer.teamviewer.market.mobile&hl=en Latency will be rather high but very very simple to set up
2) For tablets you can use direct software http://www.pcworld.com/article/260591/how_to_use_your_android_tablet_as_a_secondary_display.html