How to sell models in the Avatar Shop in the Clothing and Accessories categories? (roblox)

How to sell models in the Avatar Shop in the categories Clothing (Clothing) and Accessories (Accessories)?

I have models in .obj format, how do I upload them to the Avatar Shop and put them up for sale, while assigning categories?

Please show screenshots if possible.

It is also very important that the model is put on correctly
If this is a T-shirt, then it should appear on the character's body
If it is glasses, then it should appear on the character's eyes
If it is a hat, then it should appear on the character's head