This is pretty much all you need to do. I don't worry too much about training plans for touring because I don't ride fast when I tour anyway. The only things you need to be sure about are your ability to handle the bike fully loaded, the making and breaking of camp each day, and the mental toughness to be able to ride another 30km if it turns out your map was wrong about that campsite. You can pretty much get those by riding lots and doing an overnight tour somewhere.