Study material from MSDN, Technet and others

Plan for availability for SharePoint sites

http://technet.microsoft.com/en-us/library/cc748824%28v=office.14%29.aspx

Customize / Code behind for list forms

http://thesharepointdive.wordpress.com/2012/03/20/list-forms-deployment-for-sharepoint-2010-part-1-of-4/