1) One emp can live happily in a tank that sized yes.
2) That substrate it not suitable because it has bark chippings and calcium from what I read. Try and use coco fibre (AKA eco earth) Compact bricks of soil like substrate that expands in water - doesn't cost much and is easy to get hold of.
3) Because you are new to the hobby, I would suggest starting with an adult, but you will probably be ok with either of the other two. Its just that if you get an adult, you won't need to worry about molting. However, you don't know how old the scorp you are getting is.
4) I don't think you would need to weigh it down, no.
5) Occasional handling, every few months or so is fine, yes.
6) Pour water onto the substrate I mentioned earlier until it is damp but not soaking and that should give you perfect humidity at around 80%-90%
7) If you are using a heat mat (make sure it is on the back side and not underneath) then you probably won't need a lamp. If you don't use a mat, then you can get one if it would make you feel more comfortable about it. Emperors are a hardy species but the lamp would also enable you to see them at night.
In terms of decor, just about anything should be fine. If unsure, suggest something you might like to use and we will tell you if it is ok.
9) What do you mean? A male from a female, a healthy scorp, or an adult from a juvenile/sub-adult?
10) Nope, the TV being on is fine.
11) Avoid putting in more than two crickets at any one time or from putting things in the tank taken directly from outside as a precaution against mites or parasites.
12) Remove any uneaten prey/ parts of prey after 24 hours.
Hope this helps.
I just have some questions as I'm preparing for my first Emp.
I'll pick up a different substrate and decor sometime in the next few days.
) So I looked through some of my old hamster stuff and found this:
