How does one form a Political Action Committee ("PAC")?

Question

1. The mechanics: how to establish the PAC?
2. Contribution limits?
3. Uses of money?
4. May PAC balances be transferred to another PAC or political campaign (such as, a 501c(3) ?)

Answer 1

There are a lot of links on the Wikipedia page for PACs that will lead you to more information, besides the info in Wikipedia, itself.