PS2 Developer Kits are leased from Sony for thousands of dollars aren't they? The site that CoffeeSoda27 linked to you, quite appropriately I might add, is the centre of the PS2 homebrew community where there are various tutorials on how to get started in homebrew. However, don't misunderstand and think its easy to do homebrew stuff; especially since I guess you plan to work alone. Sure have a play around, but don't set yourself goals that you can't live up to. Learn slowly and start from the ground up. Good luck .