Ok yea so when you buy a new hard drive it comes blank. Do you have another computer? It will make things very easy then.
1. Download the media creation tool for the windows you used. If you used windows 10, here:https://www.microsoft.com/en-us/software-download/windows10
2. Load the program in the folder. After this, follow the on screen instructions.
3. Once the drive is ready, turn off your computer. Check your motherboard manual to find which key on the keyboard is the boot menu key. On most motherboards that are not oem, it will be the delete key.
4. Once you have found that key, (if it was unplugged) plug your usb back in.
5. Power on your pc, while spamming the boot menu key. Your usb should show up in this list. Go down to it...