A Proton is two up quarks and a down quark. A Neutron is two down quarks and an up quark. The antimatter equivalent of each just contain opposite quarks in them. When anti-matter meets matter, the two objects pretty much cease to exist. Yay random information.
That is a very broad question... It's kind of like saying "So tell me everything about the universe"
Is there anything more specific you'd like to know?
Its kinda like your creating a compound... Your just mixing two sub-division molecules and then you will soon have a explosive atim that can destroy a whole mini-town, in an instant