The IRS has released some guidance regarding implementation of the tax credits included in the law.  Please see their page here for additional information.

More recently the IRS has also published an FAQ on economic impact payments (rebates) that will begin in the next three weeks and will be distributed automatically, with no action required for most people.

In addition, the Treasury Department and the IRS released FAQs to help small and midsize businesses navigate paid sick and family leave tax credits.

The IRS has also published an FAQ on the Employee Retention Credit under the CARES Act.
Finally the IRS published an FAQ on economic impact payments (rebates) that will begin in the next three weeks and will be distributed automatically, with no action required for most people.