WHAT LEGO SHOULD I BUY FIRST?
Without exception one should always start a child on a small age appropriate CREATOR set. From the small tubes to the largest buckets, these sets have a simple range of pieces and very easy to follow instructions that even a child as young as 5 years old can follow and enjoy success with. I recomment starting with a very small simple set like the Creator tubes or small buckets; this keeps cost down and promotes success.
These smaller sets contain a range of pieces that a small child can easuly recognise. The instruction books that come with these sets provide clear instructions that use these simple pieces to create attractive creations quickly, giving the child a sense of achievement.
I know this from first hand experience. I started giving my own child all sorts of fancy pieces and little people, but she didn't know what to do with them. Then I gave her a small 100 piece basic Creator tube set and she was building for hours. She was 5 at the time.
HOW TO GET THESE SETS...?
These simple Creator sets are available in KMart, BIGW, Target, Toys R Us, even Woolworths usually have them. They can be purchased online, but the cost of postage usually makes it better value to get one from a department store.
WHERE TO FROM THERE?
You will see the kinds of things your child likes to build. That's when you add further sets to his or her collection, or purchase specific pieces.
MY CHILD IS VERY YOUNG (UNDER 4)!
For very young children, DUPLO is best because of the no-choking hazard and the ease of construction. Again, I would start any child on a basic set that has maximum building flexibility. For the VERY young you can get Primo by lego; these bricks are so large that only 1 or 2 fit in a tub (???) but you'd be better off getting the kid a wooden block or two; cmuch cheaper and they don't know the difference anyway.