One of the issues I had was folding the pattern along the dashed line accurately. Was always a little off. Don't remember where I read this tip. but using a straight edge and a xacto knife, score pattern along the dashed line (don't press too hard or you will cut through the pattern), this will give you an accurate fold.
I basically use three different kinds of wood because this is what my big box store has available in 1 1/2 inch square. Poplar. Oak, and select pine. I think the select pine is a higher quality than construction pine. Is usually very smooth and free from knots. Hopefully the tips you have read from this thread will give you some encouragement to give compound sawing a try. I got some tips that I will try. When I first tried, results were mostly lopsided, but finally caught on. One book i purchased was 3-D Patterns for the Scroll Saw by Diana Thompson. Got some good tips from this.
Happy New Year to all, and Happy Compound Scrolling.
Jerry