Looking for a little help on entering the stock split/spin-off on GOOG & GOOGL

Regarding the Investors Relation on the stock I found this:
If I am a retail investor, will I get any information on this split? What do I need to do?

On April 2nd, each holder of Class A and Class B shares will receive shares of the new Class C capital stock on a one-for-one basis. No action is necessary.

With IAM under the spin-off....what would the % of original cost basis retained by issuer's shares be?
And the original cost basis allocated to the spin-off shares?

Thanks