This is the final design that I wanted my decal to look like. To make this, you open the image in Adobe Illustrator, and go to the button at the top that says "Image Trace" and click "3 color" from the dropdown. From there, you can update the lines that it traced and group all of the colors together.
Then I took all of the different colors apart, so that I can print them in different colors when it is finished. I then filled in the black circle because it is the back layer, and I made sure that they all fit on top of each other being the size that they are.
Final Decal Photos:
What I learned:
With using Adobe Illustrator, I learned that if I made 1 mistake, it would be really hard to fix when it came to it later, so I had to be really careful and double check everything that I did to make sure that I didn't make any mistakes.