It should be about 15 pages
First, start with the introduction
Then the second part should be a literature review
The third part should be data analysis
where you write about the countries you have chosen (Albania, Kosovo, Bulgaria, North Macedonia, Croatia), the number of years you have chosen (from 2007 to 2017), talk about the variables you have chosen such as unemployment, population growth and two other variables(which you can choose yourself)
Also, use a histogram in this part and descriptive statistics
after that in two paragraphs talk about why you chose these countries and why you chose these years
and mention the number of observations (countries x years).
You should then add a table with the variables and describe it.
And talk about why you have chosen the variables and the relationship between them
using general descriptive statistics on STATA
analyze the results of STATA
and that is where the data part ends
Next part is Results and interpretation
after that is the conclusion
and you are done