Run with straight feet and try not to land on your heels. With that i mean try to land flat or slightly on the front pf your foot.
i belive that every1 here gave a great advice..so im just gonna say that if u r a begginner or have a short breath when u run..check this schedual on this site...
it has running programes from a begginner to advanced....hope it will be handy
Hope u find what ur looking 4...& good luck!!