Using Migration Assistant to new iMac with Fusion Drive

Setup/Migration Assistant should place all your files in the correct location. You have a few selections within Setup Assistant that lets you choose whether to install Applications, Home folders, etc. You should go through the Mac Pro to get rid of any old apps you no longer use.

Keep in mind that for Adobe, you have (I think) two computers your license is good for. So, after the migration, you might want to remember to deauthorize the Mac Pro, unless you're going to continue using it, too. This also applies to iTunes, although you have more authorizations with iTunes than with Apple.

The Operating System will be on the SSD portion of the Fusion Drive. After you've migrated your system, the the Apps and files you use most often will be moved to the SSD. So, initially, with first use, it may load from the HDD, but you'll notice things speed up with a little use as the Fusion Drive does it's stuff.