Introduction
Contextualize the problem: what is the question you want to answer, why is it important or interesting, what previous work had been done on it, what steps did you take to answer the question.
Data
describe the data you identified as available and suitable to answer the question; what were the sources and where is the data available? are more data available but not included? why ? what were the weaknesses of the data (errors, biases, missing features…)? what data wrangling and processing techniques were applied? You may want to include plots and or tables that help the reader understand the data, although you ALSO need a good description in good English prose!)