CARA is the agency in India handling adoptions and outlines the steps -
http://cara.nic.in/
then even have an instruction manual -
http://cara.nic.in/writereaddata/uploadedfile/NTESCL_635755990991507042_Parents%20Manual%20website.pdf
Contrary to the PP - while they would like more adoptions to happen domestically that isn't happening at very high rate.
You will be able to adopt a younger child.
Either you or your spouse must be a US citizen to legally immigrate the child to the US after the adoption has completed.