OK, so the main problem in knife sharpening is there isn't any one stone that will do everything. You normally need a rough, medium and fine stone to get decent results.
ANaniwa 1000/3000orKing 1000/6000will get you started if you have a new knife. ...........and here is the next issue: I always advise people to practice on their old knives before trying their luck on a recently bought knife. If you have a old knife the 1000 grit isn't always going to do the job or you will spend a lot of time trying to get a burr on your super old, dull knife.
Although all whetstones made by respective manufacturers and intended to be used together, they are not sold as a set. These sets are made by The Blade Runner.