Local league rules will specify what size ball your child will be using. The following is a general guideline:
Size 3 - U8 and below
Size 4 - U10 to U12
Size 5 - Above U12
The official FIFA size ball is the 5.
Does Color Matter?
No.
But there are practical considerations.
Balls gets scattered & moved all around a practice field. I have found it worthwhile to have my kids use balls with unique colors - easy to find, hard to lose.
For the same reason I recommend you shop for soccer balls
AWAY from your hometown.
If every kid has the same orange balls, what have you gained?
Here are some good examples of unique color combinations.
Yes.
Here is a good reference guide for quality issues! However, until your child needs a size 5, I wouldn't worry about it. In my opinion, cheaper is better for the younger ages as long as it meets the size & color requirements.
I would rather have 2 cheap soccer balls than 1 expensive ball any day.
What is it, you ask?
This is a small (size 2 I think) soccer ball, sometimes also called a mini ball.
The great thing about these skills balls is that kids naturally love to play with them. They are great for practicing turns, feints, dribbling, shooting, and of course juggling.
Why is it called a skills ball?
Think about it. If your child can learn to do all of these soccer skills with a small ball, what happens when they move to a size 3 or 4 ball? It becomes a piece of cake!
Make sure you get the right size!
Another great place to look for one is on eBay!
So that you can see what eBay has to offer, I have put below current search results for "soccer ball".