I was originally going to Copy/paste this but instead I will supply you with a link. This is a comprehensive guide to the construction of an entire language, appropriately named; [The Language Construction Kit][1]. In its over 10000 words, you will find guides to Sound choosing, word plotting, word formation, Grammar, writing systems and more. Again I would copy/paste it but, It wouldn't even fit here!


  [1]: http://www.zompist.com/kit.html