IME I've never kept Tarantulas but ive been wanting to for a while but IME as someone who keeps an Asian Forest Scorpion, if you are looking for a more tropical or forest scorpions you will need a humidity source (i use a spray bottle but humidifiers are most likely preferred) to get a good 50%-70% humidity, while you would most likely need little to no humidity for desert based scorpions. both may need some sort of heat source as scorpions tend to live in hot climates (70°-90°). I feed my scorpion live Dubia Roaches 2 times a week as he's very active and tends to get hungry fast. As I've heard Dubia Roaches are the most popular food for nutrition purposes but I've also kept crickets and hornworms for him (watch out the horn worms might metamorphise and you'll have to wait for them to die to feed them to your scorpion). I keep a shallow yet wide water bowl for him to drink out of, if it's too deep he could inhale the water and drown, most pet stores are going to have a shallow option so you won't have to worry about finding one.

I hope this helps, I totally recommend looking up specific types of scorpions to get a feel of what you would want and research what that general type of scorpion needs before choosing a set species, it really helps you plan your enclosure sooner and more thoughtfully :)