See this series of web casts by Michelle Bustamonte.
If you are a beginner, this is one of the best sources to learn WCF.
You can also start with the book Learning WCF.
Also take a look at these SO posts -
Learning the basics of WCF
What is the best way to learn WCF?
Good and easy books/tutorials to learn WCF latest stuff
Learning WCF: A Hands-on Guide by Michele Bustamante - very nice kick-off book with step-by-step tutorials. Michelle also has a series of webcasts published on MSDN.
Programming WCF Services by Juval Lowy - more systematic approach, for experienced web developers.
IDesign WCF Coding Standard
WCF Security Guidance from Microsoft P&P
Getting Started Tutorial on MSDN
and offcourse TheBestProgrammersQandASiteEver :-)
While not an instant answer for you, I found the book Learning WCF very useful; in it there's a small section on versioning (which is similar to Craig McMurtry's advice posted by Espo). If you're looking for a general intro book, it's very good. Her website has lots of good stuff too: Das Blonde
No sure why her site isn't responding; it's been a while since I've visited, so maybe she shut it down. No sure.
I guess you'll want to check WCF Membership provider. I posted a few months about it http://sgomez.blogspot.com/2007/12/wcf-membership-provider-sample.html follow the links and also I'd recommend the book Learning WCF by Michele LeRoux Bustamante.
Good luck! (you're gonna need it)
It allows you to expose a service using multiple protocols and multiple security contexts.
A very good resource for learning WCF is Michele Bustamante's book Learning WCF.
Note: If you do get this book, she has an updated version of Chapter 1 and an appendix on her website.
Her website is also a good source of up-to-date information: http://www.dasblonde.net/default.aspx