I have a VAIO SVS1513C5E Laptop from Sony (Windows 10) which I've just installed Bitkey at, using a DataTraveler 100 G3 16 GB Flashdrive for (https://www.kingston.com/datasheets/dt100g3_us.pdf).
When I was installing BitKey I used the following introduction guide: https://www.youtube.com/watch?v=GuDCdkkLPxQ&t=147s

But how does I get access to the so called "Startup Device Menu"?
The closest I've got by now is a menu, by pressing  Pause Break + FN/Shift when turning on the computer. I then gets the option to start the computer through a live CD/USB. But all I get then is that "no operative system was found".

Can the problem be that this flashdrive isn't Live and therefor not compatible with running BitKey?
Is it necessary with a Live USB for BitKey to work? And if that's the case, how do I know if a flashdrive is "live"?

Neither does the flashdrive show under "Devices and Drives" anymore. Can this mean that the flashdrive is been broken for some reason?

At localbitcoins.com is there a payment option that is called Serve2Serve - Anyone of you guys know what this is?
Google dosn't really give much of results about it, but at one website is there being linked to americanexpress.com/serve.

So my question is:

What is Serve2Serve?

Is it a way of transfering money or bitcoins? Or is it the name of a company/website that offers transaction services?

Has anyone of you guys been having any experience with these for the last 1-2 years?

I'm personally thinking of using Perfect Money when buying and selling Bitcoins. But when taking a look at the reviews about'em, most of these are at least 2-3 years old.
How is the situation now? Is Perfect Money still reliable and safe to use?

At LocalBitcoins.com is this website marked as a "high risk" when selling bitcoins. Do anyone of you guys know why this is?
Is there possible to be scammed by "buyers" at this website, as the case is when using PayPal - Where the buyer can open a complain case and get their money back?