Raid?

No. You would not want to and you can't with those anyway. All you need to do is plug in only your SSD, install windows, then shutdown and plug in the HDD. When you install software choose advanced and pick which drive to install on, same thing when saving files. That's all there is to it. They are completely separate drives.

If you want to swap programs on and off the SSD, say the game you are currently playing, you can use steammover.