What are the parts that is required to change to convert a manual drive to automatic drive?

If it is an older vehicle without all the electronics, it would be a fairly simple affair (aside from all the labor of actually doing it). Would just need to take out the manual trans, clutch, and flywheel and put in an automatic that fits that vehicle and perhaps get a longer or shorter driveshaft (possibly from the donor vehicle which should be the same make and model as the one you have). Along with a shifter for the auto trans.

If its newer with all the electronics and stuff, then it would be alot more involved of a process.

Best thing you could probably do is just sell the vehicle with the manual transmission and buy a vehicle with an automatic transmission if that is what you want though.