How about the TechNet docs: http://technet.microsoft.com/en-us/library/gg712701.aspx#Support_Internet_Clients ?
Or one of the many blog posts on the subject shown from a web search: http://www.bing.com/search?q=configuration+manager+2012+internet+based+client+management&go=Submit+Query&qs=bs&form=QBRE ?
Jason | http://blog.configmgrftw.com | @jasonsandys