And for crying out loud, if you don’t take any other advice, take this:
Tabs – don’t use them. I repeat, do NOT use tabs. In the conversion from your word processing document to HTML, etc., you will lose them. Instead, go to your paragraph style box and choose first line indent. Set that indent somewhere between 0.25 and 0.33 (this isn’t a hard and fast rule, but those are my preferences. Anything larger looks odd on an e-reader).
If you’ve read this far, I’ll add a couple pointers of my own:
1. Spend the $40 on Scrivener. Do NOT use Word if at all possible.
2. Justify your margins. It’ll look so much better on e-readers, especially as readers adjust their own margins and font size.
3. When in doubt, refer to item 1 above.