Just save all or most of the money you make in allowance or a job. Once you get it, you store it immediately in some special spot, whether it be in the bank or a special jar under the bed.
I've saved up all my paychecks for one year, and I saved up $8000, on top of that I saved all my allowance which is about another $1000.
Sadly, that's all being used for college right now, so my car that I was planning to get is several years off once again.
