Finch requires MCC access to run an Audit report. It is now possible to have up to 5 MCCs link to any account, so there should normally be room for Finch. (http://adwords.blogspot.com/2011/06/new-my-client-center-feature-provides.html)
Yes. For example, if you use Webtrends, Omniture, or Speedtrap, you need to install Google Conversion Tracking since Finch uses this to track performance This also provides you with a vendor independent data set for your paid search campaigns for future needs. For instructions on how to insert this, please visit adwords.google.com/support/aw/bin/answer.py?hl=en&answer=115794
It depends on the complexity of the campaigns, but on average, clients go live within 2 business days after the audit is accepted, the subscription agreement is accepted, and the payment information is entered.
Usually you see a significant impact or shift within two weeks after the live date. More than 90% of clients see a significant impact within the first month.