Thanks for understanding.
By the way, to address your original enquiry:
If you haven't used a sewing machine before, get to know it first before starting your leotard. YouTube will probably help with this,
Make sure you can sew a seam to join two pieces of material together both straight and along a curve.
Learn how to change to a zig zag stitch and figure out if your machine has a stretch stitch or not. If not, you can sew leotard seams on your narrowest zigzag setting.
Have a look at Jalie.com for patterns. They also have some videos to show you how to assemble things.
Good luck!