Build up a sustainable followship on twitter (1000 followers) -- 2

Hi there, I just startet a new twitter account for one of my blogs. I would like to gain around 500 to 1000 followers from active accounts (NO SPAM NO FAKE NO BOT). You need to play it out without my PW. The followers should be a good spread of most continents - mainly EU, US and Asia. (They should also stay my followers for at least 1 month!) If your work convinces me, further projects are realistic...