Make a list of the jobs around the house (age appropriate) and next to each job put a price, once they have done that job, they receive the money. For example: putting toys in a box 10p.
Create a tuck shop for snacks, open it in the morning and in the afternoon with a price list, give your child an amount per day to spend.
Reward, reward, reward! Keep the positivity by rewarding your child for good behaviour. Use a medium/large sized box/tub/jar with the aim to fill it to the top, put handfuls in at a time, not just one, so your child can watch it filling up. You can use any household items to fill it, once it is full, they receive a reward.