Hi Nigel,
I can only add that you couldn't have a better book than Keith Rowleys, both are excellent, a good few, as I had, used his book to start and it's still good for today, it is to follow as layed out the Rules of the tools and cuts, as well as understanding, as you have already found, that woods ... differ in grain, density and how they cut, all will come clear in time, as will judging, as you get a better understanding of design, holding the work, cuts, finishes and hiding how it was held as with a bowl/platter or hollow form, when see see a piece and you ask yourself, how did they do that, then that piece is worth top marks.
Enjoy your turning, have fun and most of all work and stay safe ... follow the Rules.
David