The best advice I can give to a young DJ or someone starting out in this field is a couple of things.
EXPOSURE: Depending on what type of event you are trying to get into you are going to need to build a reputation.
REPUTATION: Reputation is important because why would a group of kids want you to come and DJ their party if they have never heard of you. They are going to want you because they heard of you it is like you are special.
DONATE YOUR TIME: In order to build your name as a DJ you are going to have to do a lot of work. You are going to have to go out there and donate some time. It is a good way to get your name out there and also a good way to get exposure.
When I first started to DJ I would DJ for night clubs, college parties and the radio.These were all people who eventually grew up and were getting married so they heard of me because they were at those parties, club or even heard me on the radio and wanted me at their event.
GO FOR IT! : DJ because that is what you love to do. Going into something whatever it is you decide to do you have to really enjoy it and really want to do it. Go for it, it is a little scary but knowing that if you love it and believe in yourself there is no way you can go wrong.