Five Ugg Questions. HELP!!!!?

I know many people already ask ugg qestions but I need to ask again. I normally wear A size 9 in sneakers (Nike) but I don't know wht I would wear in uggs. What would it be? Would I be able to fit into kids uggs abd if so what size? Do the kid bauley on uggs have smaller ons? Is it true that you can get uggs a lot cheaper in tge spring abd if so where? And here is a real authetic place to buy uggs cheaper (not like too goodto be true cheap but just cheap)?