i don't know where abouts you live, but if its the uk or ireland, you might want to go see someone at the CAB or Citizens Information about the practical financial stuff- untangling the house and your legal rights and responsibilities, before you speak to him. just cos its easier to have it all clear in your head and an idea of a plan in place before it all starts to unroll, so you're not playing catch-up with events as they happen.
i've never had the breakup chat before, but i'd assume its good to know what you want to say before you start, pick a time when you have time to talk about it properly, to try and be calm, objective, and not point blame, to let him speak too, to not get drawn into any kind of fight over it- (cos emotions will be high and thats the worst time for saying and doing stuff we later regret) and to give him time and space to get his head around it and collect himself emotionally when you're done.
are you worried about him lashing out and hurting you? hurting himself? if you're worried about yourself, it might be a good plan to have a few things in an overnight bag and a friends sofa reserved, just incase you feel like you need to stay someone else the first night, or incase he wants to not see you for a little while.
i'd also be aware about problems that could happen if you leave the property too- i expect you can judge whether or not he's likely to do something like change the locks or throw all your stuff out of the windows, though.