How long have you been attempting to LD? Some people take weeks or months before they get their first LD, so you have to be patient. Have you read through some of the tutorials on the site?

Make sure you keep a detailed dream journal and record your dreams as soon as you wake up, if possible. Also do frequent reality checks. You could try picking out some dream signs too, and training yourself to do a reality check whenever you see them. Try Puffin's DILD Guide if you haven't read it already.

Good luck