There are programs out there that will make a full installer for you. You just have to add in your entire ragnarok folder. You can also make a patch installer, that you create patches, with each patch has files, and the patcher can install the client fully.
A light setup, you just create an install or zip file that has only the files that are required to run you server. For example, your GRF, your exe, and any other custom things you added to the client.