5 year old doesn't follow rules or directions. what can i do to have him listen?

My 5 year old thinks he can always be goofy and doesn't follow rules or directions. I tell him to stop his behavior or just to simply put on his pj's for bed time but its a struggle to have him do anything. i always end up yelling or counting down until i have him do something I need some advice from real trained pros (parents :)) on how to have him be a listener.