Agree with QuiltedSunshine, on the basic How To!
As to your further question, Watson .... you would still be sewing seam allowances, just a bit trickier than straight seams, as you have the challenge of getting it to lay flat.
Have you ever done an Apple Core quilt block(s) .... curved seams galore!
Doing a few of those, may help you get a sense of the how to.
I did a large runner, and amazingly got them joined "right" with the finished piece nice and flat.
The secret was a lot of patience!!
...... and unless I was in the right zone, I knew to just stay clear and not let it frustrate me!