For fonts: use the font-family property of * (meaning "everything").

* {
  font-family: "YOUR FONT";
}

if the font you want to use is a generic category of fonts (e.g. serif, monospace, or cursive) then that's all you need, but if you want to import a font from another website, you need to upload the .ttf or .otf file somewhere, and add this code:

@font-face {
  font-family: "FONT NAME";
  src: url(LINK TO TTF OR OTF FILE);
}

For cursors, you need to upload the image or .cur file somewhere, then use the cursor property of whatever you want the cursor to appear on (most likely, everything):

* {
  cursor: url(LINK TO YOUR CURSOR);
}