This is a language that I am developing for a novel. I have been working on it for several years now and still have a lot of work to do. I want to start developing a proto form of it, a middle stage, and a modern form. I want it to seem like a realistic language that has developed over millennia. I have an alphabet, but I want to work backwards from it into a hieroglyphic writing system. Any help would be appreciated, especially in creating more vocabulary.