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You could start with NARAL Pro-Choice America. Last year, they put together a Pro-Choice Postcard Party Toolkit which you can download here as a PDF.
The kit includes a sample template message (on page 6) and maps showing states at greatest risk and states with pro-choice and anti-choice majorities (pages 11 and 12).
For the most up-to-date information on state laws, the best source seems to be the Guttmacher Institute, which tracks what's going on in state legislatures and courts and regularly updates the information on its site. It has put together a table with an overview of the major provisions in each state at https://www.guttmacher.org/state-policy/explore/overview-abortion-laws.
You can look at more detailed fact sheets for each state at https://www.guttmacher.org/fact-sheet/state-facts-about-abortion.
If you know of any other good resources that can help our members campaign on abortion rights, please tell us about them in the comments.