Hi @jg714 and welcome to the overclock forums!
There are no stupid questions when it comes to optimization of your PC, and the storage in this case.
It will be a better option to install the OS on the SSD because that way you'll take advantage of the faster boot times it will provide. That being said, if you perform any operating system related task that needs to retrieve data from the drive, it will be faster then if your OS was on the HDD.
As for gaming, the only benefit from running a game from the SSD is the faster loading times. The GPU and CPU are the key components, and upgrading to an SSD will not make that much of a difference (except for the mentioned loading times and open world games and such that have to load often and load in objects, etc.). Your FPS will not affected.
Hope this helps and feel free to ask any questions you may have.