Most of what you need to know will be found in
this thread, You would create a USB install disk, Or us a USB for software to complete a External USB hard drive "Your current Hard Drive"
Macrium Reflect Would be a good program to use to copy your current HD to a Working OS etc. on your new SSD. A clean install would be preferred and save you lots of room on your SSD. However you will have to find a Window 8 ISO or DVD to create your install disk. Your Product ID is embedded on your motherboard. There are also program you can use to extract it. For some Win 8 DVD or ISO you may need to change the PID File to use your product ID, this is all covered In the linked thread I gave you.
Then you will have your current HD in a external case to save all your large data files etc.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro