Highly recommended:
Breast Reconstruction Decision Aid by Breast Cancer Network Australia https://breconda.bcna.org.au
This resources is made up of multiple modules which take you through the breast reconstruction process step-by-step and is the most thorough and interactive resource listed.
Other valuable resources:
American Society of Plastic & Reconstructive Surgery http://www.plasticsurgery.org/reconstructive-procedures/breast-reconstruction.html
American Cancer Society http://www.cancer.org/cancer/breastcancer/moreinformation/breastreconstructionaftermastectomy/breast-reconstruction-after-mastectomy-toc
Canada Cancer Society http://www.cancer.ca/en/cancer-information/cancer-type/breast/supportive-care/reconstruction/?region=on
Breastcancer.org http://www.breastcancer.org/treatment/surgery/reconstruction
Canadian Collaboration on Breast Reconstruction http://www.breastreconstructioncanada.ca
Cancer Research UK http://www.cancerresearchuk.org/about-cancer/type/breast-cancer/treatment/surgery/reconstruction/about-breast-reconstruction