A:AnswerYes this system comes with a Keyboard and Mouse combo. Yes the MB comes with 4 RAM slots and 2 will be occupied with 2x 16GB 5200 MHZ RAM sticks. Yes this case will allow for the installation of a 2.5 SSD on the top of the case if you wish to add more storage memory.
A:AnswerThis system will come with a 1TB M.2 NVME stick upon purchase. Depending on the brand of MB that was used when the system was assembled you should have 3-4 M.2 slots available (This is including the slot that will be occupied by the M.2 that comes with this system so 2-3 open spots left.)