A few sheets of graphing paper aren't going to break the ink bank but I could see that if you printed like 100 sheets
I'm going to check out the sketch thing when I get home
most definitely not, but its good to have a bunch on hand. I don't know the last time I've sketched something out perfect the first few times.
google sketchup is great, but there is a lot to learn. I'd suggest watching some how to videos on anything related to it!