To use these fonts in ImageMagick, just copy the url that's under the image of the one you want. Paste it into ImageMagick's box for outside fonts. I also make a tutorial on how to use Image Magick's Annotate for you.

The size is up to you. These fonts are sized at 26, except for the fonts shown after the line towards the bottom. Notice how they differ in how big they are, even though they're all 'sized' at 26? Hopefully this gives you a general idea of how large you'll need to make each one.