Why not download the trial and give a whirl yourself?
Thanks for getting back to me Bob. I've downloaded the trial and spent this morning trying to get a handle on it but haven't been able to figure out these things for myself and just wondered if I was missing something.
Just for anyone else who may be interested (you're probably all experts, but there may be others out there who aren't), I have discovered some of the answers through extensive trial and error and googling elsewhere.
In terms of cropping and resizing...
I have found no way of resizing by typing in numbers, but as you resize (after double tapping to get the direct selection tool - orange boxes) the numbers show you the size and, while a little cumbersome, it mostly gets close enough.
Cropping is done by dragging the white handles when the selection tool (white boxes) is enabled.
Unfortunately (and this was the most important) I have found no way of selecting multiple objects without dragging a marque around them and this creates a very cumbersome workflow. I have discovered that it is possible to do this in the touch workspace for Illustrator, but not for InDesign. Hopefully this will be implemented - unless, as I said, I'm missing something really basic :-(