Nice purchase. I've been busy expanding my A2000 over the last few months. The A2000 was my first Amiga, but I sold it when I moved to America. Then last year I managed to pick up another one from a chap in Houston. I've got the revision 4.2 mobo with a 1MB Agnus. I did add an 8MB Zorro RAM card, but I removed it when I added a 68030 and a graphics card.
If you want to use it for games then grab a cheap Zorro SCSI or IDE expansion card (Some SCSI cards cam come with RAM on them) for HD installation (watch eBay for a cheap scan doubler if you want a PC monitor).
If you want a bit more fun then add a 68030 or 68040 (which will have their own RAM expansions) along with that SCSI/IDE card, upgrade the AGNUS chip and find a good Zorro graphics card. Finally get Kickstart 3.1 ROMS, a CD ROM and OS3.9.
Anyway, I hope you have fun with it.