If you are doing a clean install, take your current hard disc out of the system, put your new SSD drive in, install windows 10 do all necessary updates, ensure win 10 is running correctly install all your apps, check for win 10 updates again you are good to go.
Get yourself an external hard disc caddy put you old drive in it copy all your data (not apps) across when you are sure everything is ok format the external drive you will now have a backup drive you can use for your data.
external caddies are very cheap
https://www.amazon.co.uk/CiT-3-5-inch-SATA-Enclosure/dp/B00647A4KY/ref=sr_1_6?ie=UTF8&qid=1490814370&sr=8-6&keywords=hard+disk+caddy
Do you have the Windows 10 Media?
if not go here
https://www.microsoft.com/en-gb/software-download/windows10 and download the windows media creation tool follow the instructions
https://www.microsoft.com/en-gb/software-download/windows10?d2784474-fdb0-4e9d-9e47-5e88c0e053ec=True to create the media, obviously do this before you take your hard disc out.
If you do not have a windows 10 product key when the install asks for one choose 'I do not have a product key' windows will install without a product key and will reactivate automatically with a DE as long as you have already run windows 10 previously and successfully activated.
Welcome to the real world!
Windows 10 Pro x64 - Core i7-2600K @3.40GHz - 32.0GB RAM - GeForce GTX 950 2GB - 4x500GB SSD Striped