You can not put your child up for adoption on The Sims 3. Though, that would be cool if you could!
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You can sell them or put the pets up for adoption.
Use the phone. It's under Call>Service. When the pop-up comes up you need to choose the adoption service. Your sim must be in the adult life stage for the adoption service to appear in the list of services.
Click on a phone or the cell phone in your inventory, and then click "Call Services". A list of different services should pop up, such as the pizzaman and the adoption center. You cannot put children in the adoption center unless you neglect them, if that is what you mean instead.
To keep your kid in school in the Sims 1 or 2 or 3 you have to make sure they are up and that they catch the bus. As long as they don't skip school they should be fine. It really is easy:)
To put furniture away you either go to the backpack on your Sims info and get the item and click it then the item that pops up on the inventory. You don't just need Sims 2 pets!!!