You will need a SCSI CD-R or CD-RW.
Also look at getting a new accelerator 040 or higher. This will usually give you a better faster scsi controller and a lot more extended 32 bit ram (32-128 mg).
Also look at getting 3.1 kickstart rom so you can install OS3.9.
I would also look at getting a Graphics card Spectrum/Picasso4/Retina 3 (not the 2 it is not rtg) even Picalo would be nice.
As a quick explanation the A2000 has a ram limit of 8mg which is very small this would be a combination of the 2091 and the 2058. The 2091 was a good controller but was put out before all the SCSI standards where set and is slow and may cause problems with some hardware. By adding a 040 or higher accelerator (accelorator slot type not CPU type)to your sytem you get a more modern SCSI controller more System Ram (faster and easier to find ram sticks) plus you will have a very fast machine (Amiga wise that is.
The graphics card will give 24 bit color.