There can be a lot of confusion with written instructions that say "Chain and turn" or "Turn and Chain". It all means the same thing. I like to turn and then chain because that is what I have become accustomed to. The chain represents a stitch or the step up for the first row.
How you turn your work is also preference and up to you. Sometimes I will notice a difference on the edge, if I turn my work counterclockwise. Most of the time it does not make any difference and is not noticeable. If it is something that will be covered up with an edge, it will not matter.
It is something left up for you to decide if you want to chain and turn or turn and chain. The direction you turn your work is also preference.