Model size and position questions

Hi, I’m Omegasa, new to modding / modeling and working on a table thats 3 tables long instead of one as the other tables are and I had a few questions that maybe somebody would answer for me.

1st. I’ve made the model but now I need to make it work in the game and i’m not entirely sure how to set it’s position or placement position using the JSON file, a little help in decoding it or a link to some help would be awesome!

2nd. The iconic version of the item when i tried to implement it made an item that was way too big and looked horrible! Can i make a bigger model and have it scale into what looks like a much smaller version and if so how do I manage this?