Andor's Trail

Where can i find skeletons in an abandoned house, where is it and how does it liok like?

Leave fallhaven to the west, go north 2 screens, you'll see a rabid fox in the south east of the map, follow that path, skeletons are in the basement at the very end
Welcome to the forums, and happy hunting

Or if your character is strong enough, go to Flagstone prison, south west of Crossgen (your home town), there's more skeleton guys there, but it could be tougher.

The Cabin would be the easiest place to get bones, the skeleton warriors at the end will drop them. You might have to kill quite a few to get the amount of bones you need (depending on your luck)

Happy hunting!