I just got that same acurite and it is great. Very simple and does everything you need.

I would give the tank a complete scrub down including everything inside. I like using the natural enzyme cleaners on my tanks. They are animal safe and do a really good job. Definitely change the substrate. I like cypress but aspen will do just fine too.

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You could make some hides for the time being out of many things. A real easy one is just a small thin box with a hole cut in it, think nutra-grain bar box. That water bowl seems to be working as well and you could hold of buying another one.

I would get the uth, tstat, thermometer and fresh substrate first.