Saving your money is a lot easier if you have a particular amount in mind. If you can't decide on a set amount, just save around half of the amount that you earn or are given. For example, if you earn $10 today, put $5 towards your savings.
Get a piggy bank or other means of storage. Choose a specific place to put it, a somewhat hidden location. Don't use your wallet, though. It may look like a decent place to keep money, but due to its easy access and portability, it's really not. Once you find a place, try to not take the money in and out until you've reached your goal