If you just keep flipping your fabric back and forth with a sample piece and cut around it you won't waste any more fabric than you have to. I am so not a perfectionist so they were definitely not precise.
When I was finished I had 9 strips of each. For my 5 yr old I used 5 strips each and for my 3 yr old I ended up with 4 each. If you only have one girl to make a skirt for you might at well make a smaller one for a gift or something :).
Then I just layed it out and figured out what pattern I wanted.
I surged all my pieces together but you can zig-zag them if you don't have a surger. Remember to always sew with right sides together and above you can see what it looked like before I sewed the two ends together.
I wanted the skirt to have a little flair so I added mesh netting and liner underneath to give it a little lift. I just roughly made them the same size, then put them inside the skirt and pinned them all together. Then I sewed them all together with a wide stitch.
Next, I made a gathering stitch and gathered the skirt to prepare it for the elastic band I attached it to.