Greetings,
While attaining the required amount of twitter followers is doable, I would need to gather some additional info in order to create a workable plan. For instance:
What is the Twitter Account for?
What, if any, incentives are you offering for followers?
What additional marketing tools (website, blog, facebook, youtube) do you have available to help gather followers?
Would you allow the freelancer access to those tools?
What timeframe are you looking to have all the followers by?
How solid is your target number? If the freelancer is able, for example to get 1600, not 2000, followers in the allotted time would that be a problem?
Upon getting an answer to those questions, I would create a proposal that outlines the following:
Organizational Overview
PR Goals
Calls to Action
Marketing Tools
PR Messaging
PR Schedule
Goals Matrix
I look forward to hearing from you.