Install Sierra on a Thinkpad T470s

Hi all ! It's been a moment since I wanted to install an apple OS on my work laptop (this one : https://www3.lenovo.com/gb/en/laptops/thinkpad/t-series/ThinkPad-T470s/p/22TP2TT470S )

So I tried to install Sierra on it. But, I haven't been able to.

In fact, I already have to OS (windows 10 & Fedora 26) installed on the SSD, and I must keep them. So I created a new partition of 220Gb to install MacOS on it.

I first followed the UniBeast method, but some people told me that it wasn't good to do that, so I switched to this tutorial : https://www.youtube.com/watch?v=pugSN7REHQg

I did all the thing to setup my USB flashdrive like in the video, without all the Nvidia stuff because I do not have an GPU... And here is the problem.

The USB stick just won't boot. It does a black screen, and then there is the blinking underscore stuff that appear, and the laptop reboot to the Boot Menu.

I'm really new to all this stuff, and I know that what I want to do is maybe a bit too hard, but well, I really wan't Sierra on my pc :) !

I hope I've been understandable because English isn't my main language :( !

And I also hope that some people here would / could help me !

Thanks a lot for reading this !

PS : I searched for solutions on the web but haven't been able to find one :(