Did this on my Brera 2.4 a few weeks ago, same ingin!
You'll need a 36mm (i think) for the oil cartridge, which says on top of it 25Nm; the torque setting.
Allen keys for the sump, and a massive bucket. Doesnt hurt to put down some cardboard to save your drive as well! Pray to the gods that the assortment of nuts on the underpanel come off. I didnt pray hard enough and had to yank it off one of the nuts, pain in butt to push back on! Various sizes on these and i think a few are phillips.
Also while you're tinkering, it might be worth cleaning the EGR (if you've still got one) mine was playing up and it was filthy...I'm gonna make a habit of doing both oil & egr from now on...more awkward but saves you from going into limp wrist mode! lol
ohh also you might wanna put some paper over/around where the oil cartridge is, its cunningly the back of the bay and drips oil all over the engine when you take it out.