You just have to open both of you directories, Project Zomboid (PZ for shot in the following explanation) and Project Zomboid Dedicated Server (PZDS for short in the following explanation) in your steam folder. Then you open the java directory in PZDS, and find each files in it in your PZ to copy them from PZ to PZDS. Then you go back at the root of you PZDS and copy the jre, jre64, licences and steamapps folder from the root of PZ to PZDS. Following that, you open both media folder in PZ and PZDS and find all directories and fils present in it and copy the same files from PZ to PZDS. after that you go back again at the root of both PZ and PZDS and open the natives folder in PZDS to copy the same files from the root of PZ in it. Aaaaaaad it's done ! Again, don't forget to save your files from your server before lunching it !! They are located in your %UserProfile%\Zomboid !