LOL.. modding is mostly replacing names with other names and deleting certain code. The example isn't the best, because I can't remember the exact code, but it's something like this.
I use coding from other weapon and change values. For instance I had a MP5 and wanted it to change to AK-47 and then set the ammo station to give me the correct ammo.
This is what is would look like in my station file:
I then change it to:
and viola... the ammo station gives me the ak47 ammo and I'm ready to mow down other people.