I recommend reading a book called "Unconditional Parenting" by Alfie Kohn as a foundation to your approach to 'discipline'. Also, the Science of Parenting, as well as ANYTHING by the Sears (google them) in relation to anything parenting.
One of the things Kohn says that sticks in my mind is this:
Think about what kind of adult you want your child to be - most people would say independent-thinker, taking initiative, go-getting etc. We tend not to 'train' them this way, oddly enough! We 'train' them to be subservient, not to listen to their instincts, to look for the approval of someone else (i.e. the use and reliance on praise, an external reward, not an intrinsic one) etc. How can the way we 'train' our children result in the adults we want them to be? Food for thought. Kohn goes into it really well.
Rewards and punishments are not utilised in my house to elicit desired outcomes. Love, modelling and sharing (verbally) the value in doing things a certain way are what we use