Here are another set rulers that you might like too. Just in case you haven't seen them. I use these for curves, scallops ore even mark a quilting line for quilting.

https://suepellanddesigns.com/

PS: Another tip for those using paper templates. Staple your layers of paper together (away from cut line) so they won't shift when you cut out the design. The excess will be stapled and then you unfold the layers.

Quilt in A Day scallop ruler is the best. No math no matter the length of the quilt border. Description and video here:

https://www.quiltinaday.com/shoponline/ruler/9045

I think that June Taylor ruler may be the one I have. There's a scalloped edge side and a wavy side, and I use the wavy side a lot. After quilting, I start in the middle and draw the waves before cutting them. This allows me to shift a little so that the edges are pointy or wavy, depending on my whim. I don't have to use bias binding if I'm careful when sewing the binding down on the top, and I also don't have to miter the edges. Looks graceful and elegant.

I use Darlene Zimmerman's EZ scallop tool. Here's a video she did with Jenny Doan:
https://www.youtube.com/watch?v=Gb16tYnYSfE

I have the Quilt in a Day ruler and love it. Takes all the guesswork out of making a scalloped border. It has two sides so you can do them differently. I think it was a good investment for me because I love scalloped borders.
I'm not familiar with the June Tailor one.

This is my comment also. I use adding machine tape to “measure” and “divide” the scallops (and other things). You can use another piece of paper to actually draw out the scallops, remembering not to make them too deep.

I like the paper and plate method and I am careful about the scallop top so it is relatively easy to apply the binding. The next time I do I am going to experiment with doing it with a facing rather than a binding. I would make it the same depth so it would be easy to finish into the seam that attaches the border on.

I just want to mention since you are a new quilter, when you do a scalloped border, you mark the scallops, then quilt, then cut the scallops. In other words, don’t cut your scallops until you are done quilting it. You don’t want all those bias edges on the outside while you are quilting.

Use a dinner plate or any other item that won't get cut by a blade. The work just as well, and you already Have them.

I think this is what I did with my Dear Jane quilt. It was fun and no scallops to bind ;)