PSU is ThermalMaster 500W Bulk TM500-PSSRM3 ,not a good one.Can you link the ssd?
A 2.5in sata drive is compatable with that board and will work with your current hdd, but you will need a sata data cable.
What psu do you have?
Yeah it has unused one.Thank youYes that drive will work with that board
You will need a sata data cable to run from the drive to motherboard. https://www.amazon.com/Monoprice-18-Inch-Cable-Locking-90-Degree/dp/B009GUXU52
I cant find much on that psu. Does it have an unused sata power connector? If not, you may need a molex to sata adapter.