Dot timing?

Hi all,
I'm new to the group.  I'm learning Simplified Gregg on my own using the book and I'm about halfway through.  I have a beginner's question.
Should you write the "h" dot before or after the rest of the word?  If you were writing the word "had", for example, would you write the dot, then the a-d, or would you write the a-d first and then go back and add the dot (sort of like dotting your i's in longhand)?  I suppose this question applies for all diacritical marks.
Thanks for your help.

(by eromlignod for everyone)