Watch the The Percieved Key of a Progression online guitar lesson by Matthieu Brandt from Songwriting on Guitar
Giving the listener some solid ground beneath their feet is a good way to start a song off. You make clear what the key is and give the ear it's home.
By chosing a chord order and a chord rate change you can make this very obvious or obscure the home feel. Even with a limited number of chords you can play with what is percieved as the tonic chord. Melody notes can give you extra information on the key you are playing in.
Creating an expectation, sattisfying it or breaking it are all tools of a songwriter.