Production:
The tip of the tongue is raised to contact the alveolar ridge (behind your teeth, but not touching your teeth). The relaxed sides of the tongue do not contact the upper teeth. The voiced air stream is directed outward over the sides of the tongue. To tell if the sound made is "voiced", place your hand on the throat lightly and feel for a vibration.
Tips for producing the /l/ sound: peachiespeechie.com/videos