I would recommend just going with the default font that you get when you create a new email or a new document in whatever app you're using (but serif fonts are now old-fashioned, so your apps will very likely default to a sans-serif font if they're less than a few decades old). Don't use different fonts for emphasis. Use italics for emphasis. In HTML, you'd use an <em> element, which is short for "emphasis" and renders in italics (the element is now deprecated). Changing fonts in a single paragraph of Latin characters does not look nice.
Say "charts, pictures, and forms" if you can. There will be cases when omitting that last comma will make your sentence harder to parse. It won't be easy to predict when you'll run into a case like that, so getting into the habit of using this (the so-called Oxford comma) is a good idea. That way, the habit will spread and everyone else will be that much more likely to do it, too.