You can put the imported assets anywhere you like. When you start a new project you can assign the drive where your assets are located. You will probably want to lave the cache on the SSD, although it will fill up if you don't keep it clean and having a drive other that your system drive to keep those is a good idea. However, you want to keep those on a fast drive, as it will effect performance. I know there is a post about the best way to configure your drives for Premiere, but I'm not sure where it is located. If you can, adding a second SSD for the caches will be a big help.
... View more