tModLoader How do you change stats of existing items, entities, projectiles, etc. in tModloader?

[CephHead]

Okay, so this has probably been answered somewhere, but I cannot for the life of me find it. I want to make a mod that changes the sprite sizes and amount of sprites of all items, enemies, projectiles, etc. It is planned to go along with a texture pack I'm making that has a more hand-drawn asthetic. I just don't know how to change stats of items that already exist in the game.

Edit: Looking at this again, it seems really unclear what I'm trying to say. I want to be able to create larger sprites, but I don't want the items themselves to be larger.