Tip 1) make Sure the Dj or Company is legit check for them on facebook check there reviews  ask people if they are good.

Tip 2) Make Sure you are not over paying get quotes from other Djs to see the average 

price range and remember cheap Djs are not always good Djs.

Tip 3) dont pay a deposit unless you no they are legit.

Tip 4) make sure they are going to play the genre you want to be played.

Hope these tips Help if you any Query's please contact me on 0729235789