We recommend using waterstones for your day to day sharpening and these Ohishi Waterstones are the best we've come across. They cut quickly but are dense and hard enough that a spritz of water is all you need to get to work (do not soak these waterstones). The 1,000 grit will establish your secondary bevel and the 10,000 grit yields a beautiful final polish.
Dimensions are 8" long, 3" wide, and 1" thick. The Combination Stones are approximately 1.25" thick.