Whether you just want to add a little flair to your world, or want to add a fully fleshed out language with original stories and texts, constructed languages, or conlangs as they are more commonly called, add all manner of depth to a world. Its a lot easier than you think once you find out how it works, trust me.
Part 1: Creating the Sounds (Naming Language): The first step in constructing languages is to work out the sounds in use phonetically. This is referred to as creating languages.
Part 2: Word Orders: Next you need to think about basic syntax, or word order.
Part 2 Supplement: Word List: A list of some words which may come in handy for your naming language and also naming locations in English.
Part 3: Morphology, Character Names & Typology: This part is about creating some basic morphology for your naming language, naming conventions for surnames, and a supplement on typology.
Part 4: Naming Languages: Bringing it Together and Putting it to Use: This part is about creating some basic morphology for your naming language, naming conventions for surnames, and a supplement on typology.