Adopting one or two Chinese Girls under 3 years old

Yes, it is possible, but you may have to get married before the adoption. And you need to prepare some documents:
international adoption application, birth proof; proof of your marriage; documents stating your professions, incomes and property; proof of your healthy body; proof of no record of criminal sanctions and others.
Which city or where exactly are you going to get the kids? Then go to the local Civil Administration Department for consultation.