it looks all a bit confusing but it isn't that hard actuall…

it looks all a bit confusing but it isn't that hard actually.
The official 1Sat page is more like a backend and others built better interfaces. to your question: you can create a collection to add more items to it on @OrdFields and 3dordi.io from @J1 Pelaez. So you mint them to the collection for other users. there is no way to give others the ability to mint your minted item. this make no sense if I get you right. minted is minted, it's on chain, not some premint or pointer.
If you talk about Treechat you are the only one who can mint your images. I suggested the devs to give other the ability to mint your image for a manually set price.
A 1Sat stream could actually be helpful. I think about it. feel free to ask further questions.