Need help to Analyze deal

[Jay Yiu]

Hi all, today i want to ask how to analyze deal and any quick tip to analyze deal or how to know which one is good deal or bad deal? For example I saw a house for sell and i want to buy it, it can be a rental property. 1. What number i should know? 2. Where and how i can find those number? 3. How can i put all the number together? 4. After all what number finally i can get to know a good or bad deal? Any quick tip