Building a Workstation

I'm looking to build a workstation in my dorm. Right now all I have is my MBP, Razer Orachi mouse and 2 HDD's. I am looking for a second monitor and possibly a keyboard to complete my set up.

As you can see it needs to be a smaller display and I'm looking for something under $200. Any suggestions?

If I go with a keyboard it will probably just be the apple desktop keyboard as I have grown so accustomed to it now.

Any suggestions for other things that might help a freshman CS major through his daily life?