Need help putting my custom items into the vanilla map as world objects

[austin3rockr3]

hello im a beginner modder. ive created Mootin Diw, Corner Store Candies and Soda, TV OVERHAUL and Mauldraugh Cottages.

i have MANY more ideas for mods but need to know how to have the game use my world objects when generating worlds.
As an example, i would like to have my custom TVs spawn into vanilla homes and replace the basic Valu Tech and Premium Technologies Tvs. Or at the very least have them randomly spawn in garages and storage units. Basically i would like to know how PZ distributes random generators so i can do the same for my items

 

THANK YOU FOR ANY AND ALL HELP!!!!!

[austin3rockr3]

overlayMap["appliances_television_01_8"] = {{ name = "other", tiles = {"-NAME OF MY ITEM SEEN THROUGH TILZED PACK VIEWER-"} }}

 

is replacing items even possible through overlays? im hoping i can just overwrite items with my own.