Welcome aboard! You will find when the Amiga bug bites again it's very difficult to shake it off.
I would also say spend some time with an emulator first, get to grips with things and see how you feel - Amiga hardware is fantastic but it's an increasingly expensive hobby. I love my A1200 but it was not cheap to put my setup together
Whilst you're getting to grips with it, may I shamelessly plug the forum's game competition found in my signature? It may help you get back into the swing of things and you can have a bit of fun with other players posting your best scores too