Have you played any other Dragon Age titles? You might be a bit lost with Inquistion if you haven't! I suggest that you play the others ones first. Although gameplay wise they are different their stories are amazing and tie into Inquisition.
Make sure to play The Legacy DLC for DA2 as it introduces the main baddie in Inq!
RE: My first steps into Dragon Age Inquisition, a journey of customization, surprises, and deaths.