DS is 5.3 and gets 50p a week. Not specifically linked to jobs but linked to the fact that he is older than DD (who does not get pocket money) and is expected to do more to help around the house than her. Its one of his "now you are a big boy" things.
If he wanted a magazine, I would buy that separately.
He and DD also have pasta jars - so, for example, they had watched and enjoyed Ice Age and I said that I would buy the Ice Age 2 dvd when they got 10 pasta pieces each.
Think pocket money is a good idea. DS is very keen on playmobil and loves to save his pocket money for them. We have a look at the playmobil section of the toy shop every week and have a discussion every week about how much he has and how long he has to save up for.
He has a money box, which he is very proud of.