Installing GAMEs on a SSD will not IMPROVE the game in anyway. If you do a Google for ADD SSD Tips and tricks, you will see the common way to use a SSD is for Windows OS and large programs (CAD, MAYA, etc.), so that when Windows needs to look up a font, or tell the computer how the mouse buttons work (drivers), etc. It doesn't 'slow down' your gaming experience waiting for Windows to do all this 'background stuff'. That said the first thing to know is SSD have low read /write lifecylces as compared to HDDs, so the best tips are to turn off Virtual memory, when you install programs go to thier Preferences and set the temp / log files to your normal HDD and so on.
Don't forget a SSD is very SMALL and will run out of space quickly if you just 'default' on all settings and installs. Unless the system comes preconfigured with one, you do have a long term maintenance and remember to manage things when doing this sort of upgrade.