These *sound* like general debugger-use questions, so I’ll answer then accordingly (if they aren’t and I miss the mark let me know and I’ll try again 😉
1) To find what a method call returns, you should be able to add that statement as a “watch” variable. The debugger will evaluate it and show you its value. You can of course dig into the result set object yourself, but its quite complex and actually finding the content that its holding might prove to be tricky.
2) Stepping through line by line is done via the different controls in the debugger view. There is a step over, step out of, step into, continue, stop, etc. It should be in the top bar of the top-left panel in the debug perspective.