The simply metal cases will help protect from water and small animals, and you usually can collect plenty of them when you buy Pokemon Cards
I would end at fossil at best and more realistically just put base
In theory (although not in practice), a booster box could contain zero mythics and all bulk rares, or it could contain a complete set of foil mythics
Put Ursulas Stolen Trident on the far left of the large box at the bottom of the mat
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excavate the top cards of your Deck, equal to the number of monsters in your GY (or as many as possible), and if you do, if 2 or more monsters were excavated and all excavated monsters had different names, add 1 of those monsters to your hand, also place the remaining cards on top of your Deck in any order