Hi,
Back to the Marples…. I have not used their turning tools but have many of their hand tools and they are very good. That said, I do not know how new yours are, or if they are HSS. Unless marked, keep water or something to quench them in (very very often) at the grinder. If you blue them the temper is toast if they are not HSS or better.
As to technique.. for bowls I think Lyle Jamieson’s “Bowl Basics, the Easy Way” is the best, followed by Bill Grumbine’s “Turned Bowls Made Easy”
For spindle, the best I have seen is Dave Hout’s “Spindle Turning” but it may be difficult to fine.
For the skew alone, Alan Lacer’s “The Skew Chisel, The Dark Side, The Sweet Side” would be #1 even though he does not address the spindle gouge. Dennis White’s “Turning Between Centers” is very good if you already know a little. There is very little verbiage to explain what he is doing but the video is about 75% where the tool tip meets the wood.
You did not say what type gouges you have. Do NOT use a spindle "Roughing Gouge" for bowl work. For bowls you will need a bowl gouge.