Essentially, you're creating a composite variable (combining multiple indicator values into some overall index). Here is a good resource to get you started: http://www.oecd.org/std/leading-indicators/42495745.pdf
I would like to know how to build a ranking of multiple dimensions like, for example, "The Global Competitiveness Report", in http://reports.weforum.org/global-competitiveness-report-2015-2016/