Lotsa noob questions - Which lizzy will suit me best?

[Phyrex]

Hi guys,
I’m very new at this and have a few questions.

I have an empty 100 gallon terrarium (160x50x50 cm) and am thinking about the possibility to keep lizards or some other cute animals (no snakes! *lol*).

I personally like Geckos and Chameleons a lot but I haven’t done any research on them so far. (I keep Carnivorous plants, but don’t worry I won’t mix them with animals *grin*)

If it’s not too much to ask I would like some information from the experts.

I prefer to have a tame lizzy at least. One that doesn’t bite. And isn’t stressed a lot when you pick it up and put it on your shoulder. Or maybe I should just get a dog?
I’m very against animal cruelty so if I’m not 100% sure my animal is super happy then I won’t buy one.

So the first question is:
1)
What lizard would suit me best?

2)
I assume the terrarium is pretty big for a lizard.
Is it possible to mix different kinds of lizards in one enclosure? Or multiple of the same species for all I care. (No breeding please )

3)
How much will a complete terrarium setup for a lizzy cost me approximately?

These questions for now, when the answers suit my flavour then I will probably have many more questions to come.

Thanks for reading.