There are tons of resources for getting started on reading Lenormand cards, besides this forum, which is one of the best resources.
http://www.divinewhispers.net/lenormandlessons.htm This is a really good place to start, with tons of links to blog posts, podcasts, free downloadable decks, and teaching videos.
http://www.cafelenormand.com/ A blog about all things Lenormand.
The links above will undoubtedly lead you to more resources online.
There are also some paid online Lenormand courses that I've heard really good things about, especially the ones on Cartomancy.net and Iris Treppner's course. If you search the archives here, you should find more info on courses.
If you prefer books, I'd recommend, all of which are available in paperback or as ebooks:
The Essential Lenormand, by Rana George:
http://www.amazon.com/The-Essential..._sim_14_2?ie=UTF8&refRID=1C7VEFB70Y475G6AG1SH
The Complete Lenormand Oracle Handbook, by Caitlin Matthews:
http://www.amazon.com/The-Complete-Lenormand-Oracle-Handbook/dp/1620553252/ref=pd_cp_14_1
Lenormand Thirty Six Cards: An Introduction to the Petit Lenormand, by Andy Boroveshengra:
https://www.amazon.com/dp/1500582484/ref=cm_sw_r_awd_.Yh9vbX793TGJ (make sure to get the 2015 edition)
I have all three (and the one by Sylvia Steinbach), and I like them all a lot. I think Matthews's book is organized better as a learning program, but I find George's and Boroveshengra's symbol meanings and card combo interpretations resonate more with my own way of reading. So I tend to use the books together.
There are several threads here that give reviews of these and the other Lenormand books that are now available.
There are also a bunch of Lenormand groups on Facebook, where people share readings and interpretations. That can be a great way to practice.
Hopefully, that's enough for a good starting point, and other people will add resources I missed.