First off congrats on the future boy!! Mojave's are awesome, especially if you're getting one as your first Ball.
If you're just using paper towel, 92 degrees is a very good temperature to keep the warm spot. I wouldn't go any higher, personally.
You do not need to give them a dish big enough to soak in; just one big enough for them to drink out of. As long as your humidity is at a good % and the snake doesn't have mites, they won't really need to soak.
Also, with a tub, you probably won't have to worry about misting unless you live in a very dry area. That's what's so great about tubs. They hold in heat and humidity very well.
Do not let the snake sit on any wet substrate for too long. It will cause the humidity to skyrocket and could cause belly rot if left for too long.
A week is a good amount of time to give them to get used to their new home. I usually wait 3-5 days for my new guys unless the snake is a hatchling.
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