How To Use Microgynon Contraceptive Pill?

hi I'm writing from Mongolia. please give me an advice, how \can i use a contraceptive pill called microgynon? from what day can i begin to use it after my menstruation? and i've never been use any pills and abortion. and i have a 2 years old boy. now my husband and i use condom. i don't smoke. i'm 25 years old?