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Great questions. Very simple, so click on object and it places itself (can use attach points so the graphics know where to go), no animations.
Consistent updates of new content would be the only planned "maintenance" and it will all tie into social media. If it's feasible, perhaps integrate incentives, eg, sharing, liking, referring a friend, partaking in limited time only offers.
I suppose something like this but way better. For something this simple, it got over 500k downloads. https://play.google.com/store/apps/details?id=air.fizizi.PrincessDollFashionDressUpGames