Make a table in google docs and then shade in the parts where you put your stuff. :D
you make it sound so simple ! But im using google docs, and it's not helping me at all. :/
Ok I'll explain it step by step. First go to a new google docs, and then there is an insert button at the top. You press that and there should be some options, then you hover over table and you drag your mouse until you get a 20x20 or a 19x19, etc...