Have you installed the board package yet ?
The MKR section has that aspect covered.
BTW you have to QUICKLY double tap the reset.
You can also for the most part ignore the amber light as that has a specific use that you will read about in the MKR section.
Also ensure you are using a proper DATA USB cable and not just a charging cable as there is a vast difference between the two.
Oh and avoid USB 3.0 ports too