Guys I'm new here
Probably new to macworld too

I bought a MacBook Pro 15" mid 2012
Core i7 2.3ghz 4gb and 500gb HDD

Planning to upgrade to 16gb sodimm ddr3 and Samsung Evo 850 500gb

Since I don't have any personal data in that MacBook . I read that I need to make a bootable USB drive with OS inside prior to installing

Question is
1. If I load the new ssd inside , then boot from usb and install OS on that, how do u install drivers (like windows need to install drivers)

Or I don't need to install drivers and all will be fine to use like WiFi, Bluetooth, GPU etc

2. Another option is cloning but I'm not that familiar with the way

Thanks

What button to press upon reboot for that to happen?

Thanks