How to analyze a duplex to see if it is worth my investment?

[Dan Smith]

I am just starting out and I have recently found a house on the MLS that is a duplex which needs some work but it is selling for 99,000 and has 1 existing long term tenant already paying rent of 825 per month.

2 questions:

1) What is the exact formula or guide i can use to analyze this house (Duplex) to see if it is a good investment as a rental property? 

2) Will the information on the MLS page be sufficient to run this calculation or do i need other information and where would i get this other information?