Gerbil. What do I need to know?

[Stockannette]

So, as some of you know, I'm volunteering at an "exotics" rescue. A group of four gerbils were rescued, one died, and eventually they "de-clanned" - one had to be separated from two that were attacking it (I say "it" because I really have no idea if they are males or females - of course I'll ask the Rescue Pres. about that).

Anyway, I'm slowly convincing my husband that maybe we could foster the lone one. If it can't be with the group, at least it can be "with" a group of people. Does that make sense?

As you may also know, two hamsters (Carmelita and previously my dear Flower) are the only rodents I've ever had. So, tell me about gerbils... specifically:

Are they a look-at-but-don't-handle type of animal?
Or a too-fast-but-give-it-a-shot type? Or ...?
Would it be "good for it" to come stay with people (not that we are a good substitute for gerbil-y company, but... maybe watching us would entertain it?)
Or would it be best to try to "re-clan" them later?
Or would it be best to try and pair it with another single?
Do they get out-of-tank time / ball time / etc.?
What else do I need to know?
What are good web sites for me to peruse before making a commitment such as this?

Thanks in advance; I hope you don't think I'm a dingbat with such questions. "Let me ask on HC" was my first thought.