Yes, you can put specific things in the family inventory. Just go into buy mode, open the family inventory tag ang drag furniture or whatever into it.
Yes, you just have to be in the edit town mode (in options), and then use the build/buy tool on the empty plot.
It looks like Vacation, but it has three recognisable places (Egypt, France, China), your Sims will get quests to do, which will grant them rewards, and some new skills (photography, "nectar"making and martial arts) can only be learned in appropriate destinations.
I went and checked to see if my memory was working all right.
To put something in the family inventory click on it, once, move it to the inventory, and then click again.
Have successfully placed a car, a fridge, a sofa and a dishwasher there just a minute ago.
You can edit a new town without choosing a sim. When editing an existing town you will automatically go to the family you played last, but you can then go to the edit town mode.
Remember that if you then decide to choose a different family, the previous family will lose lifetime rewards and points.