Little update here.
I can't recommend storms editor. Try to replace the steps that involve Storms Editor with the same step, but using "Tibia Editor". I like the idea of Storms Editor, but it started making random colored pixels show up as invisible in my server.
Also, in Step 4, I don't know why, but when I created new CIDs using any editor, it started erasing the first CIDs (I think these were a baking pan and a small hand axe or something, whatever the first items were). For now, I've just been changing items that currently exist that I have no use for into items that have my new sprites and function as items that I DO want.