Most word processing programs will automatically convert three full stops in succession into an ellipsis, when you are typing the document.
They don't do it automatically. Instead, you've got to change the AutoCorrect Options (under "Proofing" in "Word Options"). There's a "Replace text as you type" feature, so it'll insert a copyright character if you type "(c)" or and ellipsis when you type three dots.
As for font selection, most ereaders are much more forgiving than they were years ago, and there are very few uniform width characters in use anymore. That means that virtually all the fonts available (with the exception of the ones you embed in the document yourself) will support publishing characters. Even then, it's easy to check out if you know how.
I'm always using custom fonts in my chapter titles, but I've done it so frequently, I know how to access most of the special features (tails, accent marks, curly-ques, etc.) that are a part of the original font designs.
If you're ever curious, ask and I'll talk your ear off! 'D
You might want to investigate which fonts are commonly supported by your target audience's equipment, unless you have a way of including the font definitions with the document. PDF/A allows you to do this.
Epubs do this too, and it's getting more and more common to include custom embedded fonts. The main sticking point, though, is the liscensing, as most font designers charge you exorbinate rates for embedded fonts (as it's commonly used to add fonts into game consoles, so they charge you as if you're producing a million-game series).
Instead, what most authors do—and what I do—is to purchase a single-use Professional license (which is only valid for your first 50,000 sales), and then use the font to create graphic chapter heads. Easy-peasie, no font-embedding necessary.