If you are searching for answers regarding health reform, otherwise known as Obamacare, one of the best places to look is on the Kaiser Family Foundation website. At their Frequently asked questions page (http://kff.org/health-reform/faq/health-reform-frequently-asked-questions/), KFF answers questions such as “Can I be charged more if I have a pre-existing condition?” (http://kff.org/health-reform/faq/health-reform-frequently-asked-questions/#question-can-i-be-charged-more-if-i-have-a-pre-existing-condition). Other more general information is available at http://kff.org/health-reform/.
The official government website tp find information regarding marketplace health plans is https://www.healthcare.gov/. A great place to start is the Quick Guide to the marketplace, at https://www.healthcare.gov/quick-guide/.