For standard committees, the best way to go about researching is to figure out your country's stance on the topic at hand. Below are some useful links to get familiarized with the basics of your country. Statistics will help immensely to prove your point.
Understanding your country's stance on the topic, what countries agree with that stance, and what countries disagree with stance will be tremendously helpful! Other important characteristics of your country include its socio-economic status, its key imports, and its key exports. Feel free to expand your research options to journals, think tanks, and periodicals. Finally, always keep in mind that the end goal of research is to formulate a resolution will solve the problem at hand.
For crisis committees, a delegate's most crucial resource will be the background guide! Each background guide contains the context of the crisis, the powers of the key players, and ultimately, the full responsibilities of the delegate. More so than in standard committees, background guides will serve as your guide through the entire preparation process!