H1B Remainder Process Steps and Time


I have searched around but cannot find the answers. Does anyone have knowledge for the following questions:

  1. What are the steps to apply for H1 Remainder Option?
  2. Can I start to work after I get a receipt from USCIS or after I get an approval from USCIS?
  3. How long will it take to get the receipt or approval?

Thanks in advanced.