Acer Nitro 5 ram upgrade and storage upgrade

[panicbuy]

Hi i have a acer nitro 5 laptop and want to upgrade ram to 16gb and also want to upgrade to m.2 drive
If i currently have ssd drive and add m.2 drive would i need to do a fresh windows install
Also where is best place to buy ram and storage for my laptop pls

Any help would be great

 

[panicbuy]

thanks as i only game on laptop and watch videos i assume 16gb ram will be enough
not really sure on storage but what about m.2 1tb

Thanks for replys