Most people ask about Cost as one of the first things.

Ask what the DJ will do.
Ask what the DJ will bring.
Talk about his experiences.
Talk about how he can entertain at YOUR event.
Ask what music he will play.
Ask for references.

Then will all of this in mind ask the price.

From 1st June I charge for 4 hours on a Saturday £200. Childrens and Teenage Parties ask for details.