Sorry for being a noob, but is there any place to put mods into the server?
Being new isn't a bad thing, as long as you're searching for knowledge and not hand outs : ).
What kind of "mods" are you trying to add? I don't really know much about self contained mods that can be attached to a server.. but there are many things that you can do to edit the game play produced by your server:
Generally, the easiest modifications you can make are by editing ".xml" and ".lua" files found in your servers directory (for me these files are found in C:\...\Mystic Spirit 960\data\). MOST of the tutorials out there are for this kind of editing. If you are a beginning programmer, editing these files is all you really have the capability to do. The things you can edit here include editing/adding monsters, spells, vocation stats, item stats, actions in game, and many other things.
If you want to edit some game play function that is outside of these .xml and .lua files... you will have to download the source code for your server and edit the rather complicated code there. There are very few comprehensive guides to modifying the server source code. Modifying the source code requires much experience in the C++ programming language. Asking around, I was told how to get the source code for this server:
The source code can be downloaded using Subversion from this URL:
svn://svn.otland.net/public/forgottenserver/tags/0.2.14/
You will have to do research on what Subversion is and download a Subversion client in order to get the source code. Once you have the source code, you will have to read through it and understand how it works in order to modify it. Once you have (hopefully correctly) modified the source code, you will have to compile it. There are tutorials available on how to compile the source code for various "The Forgotten Server" versions.
Finally! If you want to edit how the client (i.e. Tibia.exe program) looks, you will need to look into programs like resource hacker and see what is possible. Client editing is extremely difficult as CipSoft does not distribute source code for their client. You CAN go another route and use the open-source otclient found on this forum, but it will take lots of time to understand the source code (just like it will take much time to understand server source code).
If you want to add some feature into your server/client. It is best to state what feature you want to add, and people on this forum can tell you whether it's a simple edit or involves some complex source code modification that most people don't have time to figure out themselves.