From what I understand there is not a full manual for the Hind. There are several different guides you can use; The Quickstart Guide (This is the link to the russian version that has been translated to English, as it is more complete) https://www.digitalcombatsimulator.com/de/files/3317188/, Chucks Guides https://chucksguides.com/aircraft/dcs/mi-24p/, and a museum guide from Texas. https://mudspikefiles.s3.dualstack.us-east-1.amazonaws.com/original/3X/7/a/7ab064a7f951b9f0325354f257f5e58c571936d6.pdf
Hope this helps.