Problem installing new ssd(Samsung 850 evo m2) dell 7559

Hi I bought the 7559 and I am trying to install the new ssd. It didn't come with an hdd but an ssd, sandisk z400s m.2 2280 256gb. I read online you can upgrade it to a better one, the Samsung Evo. But when I go to install it and boot it up it says no bootable devices. I've seen videos of where people just put it in and it's done, so I need to download something before the installations? I'm fairly new into the world of upgrading laptops/pcs so any input will help. Thank you