I need help in making an analysis on a dataset of different individual basic salaries.

I will be using excel.

Basically I have a line per individual, their salary and a set of other variables such as age, gender nationality, so different types but all at the same point in time.

What method should I use to understand which/if any of these variables explain having a higher than average salary?

Later, i was also thinking that it could be interesting to try and understand if there was some correlation between some of the above variables and being promoted (binomial) and having a higher than average salary increase (continuous).

Many thanks for any help you can provide me.

D