Someone just may hit you if you throw out the wooden spools, they are hard to come by and are a collectors item, as well as very useful in many crafts etc.
The thread, do a break test on them, if it breaks easily then it is rotten and the actual thread can be disposed of,
the bobbins are just that, prewound bobbins, yet again check the quality, they should have a size stamped on them to tell what machines they will fit.