Hello and welcome Colin. My initial thought was that you had over-stepped the mark by using spalted timber for a first attempt at bowl turning. Spalted timber has features that accentuate the problems of end grain tear-out. As Crazylegs has said, sharp tools are essential, but tool technique is critical. I would suggest that you follow Crazy's advise and get some guidance, either through professional training/tuition, or by attending a local wood turning club.
In the short term, get some more wood that isn't spalted and practice, practice, practice.
Finally, beware the video culture on the internet...there are hundreds of excellent videos, but there are thousands of bad ones and at this stage in your new hobby, you won't appreciate the difference between them, so you'll get drawn into bad practices.
Les