Crazed

Anyone know of any resources that offer information on how to make your own flavorings? I have spent many hours/days sifting through recipes and packaged flavorings ... I need to make my own flavorings due to health restrictions. My wife has an allergy to products that associates with PG, i.e. she is allergic to PG. We have plenty of Palm derived VG and are looking to create some flavors. Any references would be most appreciated! Thank you.