Serger Thread Question

I did a search before asking, hope this hasn't been done to death as a
topic. I would prefer to buy a lot of thread off ebay for my new
serger. I see woolly a lot, what is this? I am assuming embroiderery
thread won't work. Any types I should avoid? I will be making simple
childrens things mostly and a few things for myself.

Also can I use regular thread spools on my serger?

Dana :)

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