Migrating from Windows 2008 R2 to Windows 2012 R2

I am about to migrate from a 2008 R2 server to a 2012 R2 server.  I have not done a conversion since I migrated from 2003 R2 to 2008 R2.
I'd like to start the process overnight and see, if I can break the migration down to small steps without affecting production.
Here are my questions.
1) Does the replication process move my actual applications from the old server to the new server?  Meaning my Accounting applications like QuickBooks and Creative Solutions Accounting Suite.  Or will I have to manually install the applications on the 2012 server?
2) I'd like to end up with 2 domain controllers when I am done (keeping the 2008 R2 server).  Do I have to split roles between the two servers?

I have other questions, but would like to start here.

Thanks for your consideration.
jhillbosAsked:
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Scott CSenior EngineerCommented:
1.  No, you will need to manually install your applications and move the data on the new server.

2.  No, you don't have to split the roles between the two server although you can so that if one DC goes down you won't lose all of your roles.  

You can see what roles each server has by typing "netdom query FSMO".

Once the migration is complete just promote the new 2012 R2 DC to be the PDC and your 2008 R2 will be your BDC.

You can definitely do this in stages and have little to no impact on your users.

I recently did a 2003 to 2012R2 migration and the users were not impacted at all.  I did this during business hours.
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Rakesh KapoorCommented:
In addition to ScottCha's answers if you need more details around FSMO or not sure about the steps to migrate FSMo roles then you can check this article.

http://www.itingredients.com/what-is-fsmo-roles-flexible-single-master-operations/
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jhillbosAuthor Commented:
That was a big help and got me started!
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