Welcome back :-)
It's a bit odd that the Kickstart screen says you have a 3.0 ROM, as that version was never available for the A2000. You sure it's not a 4000 you have?
Well, regardless, the first step is to get yourself a hard drive and some Workbench version 3 disks. You should also take a full inventory of everything in the machine, such as any expansion cards, and chip revisions, if it's not too difficult.
Don't hesitate to ask if you've got more questions!