Reader call: "normal" first few periods post-partum

For some reason the questions are coming in clusters. I've gotten a couple about the first period back post-partum, and what's normal. The specific questions asked were:

When's normal for your period to return?

What's the period going to be like post-partum (length and flow)?

Will the length of your cycle be different?

Is pain when trying to use tampons normal?

Everyone, please put your data points about these questions and anything else you want to say. Obviously you should feel free to comment anonymously. Since I don't want to post the details of my menstrual cycle online publicly (imagine), I'm going to comment anonymously in the middle of the pack, too.