First of you need to get hold of at least a few things to such a baby, 1st is a decent sized 2.5" HDD (4Gb to start with is superb as you won't have much trouble with filesystems not able to acces the hole drive), 2nd is a 030 turboboard with at least 16Mb of memory and if you want to get on the internet you will have to get hold of a PCMCIA ethernetcard that is compatible with the Amigas 16bit PCMCIA port and the drivers you can find on AmiNet. I sugest you get hold of a 2.5" -> 2.5" -> 3.5" IDE cable aswell so you can plug in a CDRom.
Got that and you are well on you're way... then when you are more confident in you're Amiga choise and abilities there's PPC cards, graphiccards and soundcards, newer OS etc to go for aswell. :-)