Be creative. Use lots of fonts. Match the original. If you're awesome, get a wacom and start drawing in text.
If you need a tutorial on how to type, we got a problem.
- Do not try to fill the bubble. Try to size the fonts based on mood and consistency. Consistent font size is lot easier to read.
- After the priority of setting the mood, the goal is ease of read. Don't use crazy fonts that's hard to read. Remember every font has a unique personality. You should match the font's personality with what's said. And then there are neutral fonts.
- More effort usually translates to higher quality. Typesetting isn't hard, it's endurance that's the real issue.
- If you were about to type something in Comic Sans, before you commit the crime, visit here: http://comicsanscriminal.com/
Go to a university... college... go live in another country... something...