I need a bit of help

Ok so my friend started a TTT server and I need a bit of help because he wants me to add things like pointshop items, T weapons, D weapons, and other stuff and I dont really know how, so I was wondering if someone could help me like with a beginners guide on how to like add things, I use filezilla as FTP and i just need help on like what file goes where like maps, t weps and others, If someone could tak there time to help me my steam name is Shawn6623, if you would like to help me please add me. Thankyou