Moving Databases from one server to another

Hello,

Here's the set up:

2 Servers:  2008 R2 Sp1.    One active one passive. These are the servers that contain DB's that need to be moved

2 Servers:  2012 R2 Stnd    Want same set up one active one passive, These are the destination of DB's from above

All are part of same domain.

Are there any step by step guides out there for this?

Thanks for any and all information!