Migrating from 2008 standard server domain controller to 2012 R2 DC?

Questions:

1) Can you even MIGRATE between this two OS's? Bought a new domain controller;no upgrade

2) On transitioning/replicating from old to the new DC, do you name them the same example: DC1 or does it have to be DC2? Or upon the switch you rename it back to DC1?

3) When doing the switch, do you change the new DC to the old DC's IP address?

Thanks