Hi hArry,
It is very very difficult for a physio to dispense advice without using our 2 main assets - our eyes and hands.
Without assessment - seeing and feeling what is going on, it is hard to tell you how to do an exercise properly.
Also, we can tell you what exercise to do but we might want it done slightly differently because you have a certain need - how do i teach that to you?
I think all of your questions are great and should be made clear during your next session with a physio so you can get good advice.
my *general* rule about weights is - if you push it, you have to pull it. In other words make sure the muscles do equal amounts of work in all the related directions.
Good luck!