Nothing better than download it and try for yourself, it wont explode your pc 
No, but I would have to register an account that will never be used again, spamming both my email and the game's database. Are you always so helpful?
Yes because your core is i3 it will work.but if you have a slow internet connection i think its not playable and its better to do not play..
What would be the min. bandwidth required? (at least from your experience/what you have read/heard).
Shouldn't use too much bandwidth, and it's not graphically intensive. You should be fine.
That said, IIRC, the movement speed in the game is related to your computer speed. Weird, I know, and I'm not sure if that was ever fixed. But you should be good regardless.