When is a good time to get children doing chores? We have had them start as soon as they can walk, all the way up to never doing chores. Some could argue and fight so much better that we could not begin to have enough energy to get them to do them.
I think the best method that worked for our family was that they were all assigned a room. In the morning before breakfast they had to make sure their room was cleaned and swept or vacuumed. In the evening they had to do another quick clean before dinner time.
That seemed to work best for our family. Yes we tried chore charts, awards, rewards, you name it. The only thing that really worked was just, get your assigned room clean everyday. Less arguments and I don't forget who has what chore, works great.