What are the jobs of Colombia's president?

I ned to know his duties as the president like what he does as ping Bills and stuff like that.I cant seem to find anything but then again im not a very good Googler! Plus i need to know the divisions of the government and their duties, major parties of the government, and explanation of the role of a citizen (voting etc.) :) So please can anyone help me! 10 points to the best answer!