20 Computers wont help you if your on the same IP.... and if you don't know what that means then I would highly suggest buying the stealth guide. It answers both your questions in detail.
Making new PP and EB accounts is easy. The part of making sure they last is up to you.
i guess you have not sent enough time reading around these forums to be asking those kinds of questions.
My dog can make accounts, but i am only one in my house that knows how to make them last. So keep reading and reading.