Once you have found a monitor. You need to find out what Kickstart/Workbench you have. Randge varies from 1.2, 1.3, 2.0, 2.1 or 3.1. 3.1 is best as you can do networking incl. internet, web on that.
Also a hard disk helps to minimise disk swaps, a CBM A590 or a GVP add on via expansion port would work.