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Photos has not yet been released publicly, only a public beta is available. I'm afraid you'll have to wait until April when it is released.
 
The first time I opened Photos it detected my iPhoto library automatically and migrated over.
 
The first time I opened Photos it detected my iPhoto library automatically and migrated over.

Me too... It sorta 'just worked' like that. I have only migrated my iPhone and laptop (aka small) photo libraries. My dual screen iMac Aperture library is, of course, still only held locally with a Synology back up awaiting a public release/nonbeta version of photo library.
 
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