I can answer some of your questions.
As far as using a TT with the Denon RCD-M39s, I see there is one analogue input for an external device.
But the output level of a TT is very low and cannot plug directly into the Denon. You would need a phono preamp which boosts the volume of the TT and then plugs into the Denon amp. Now you would have a signal from the TT that is high enough for the amp to play it. Without this preamp, you would not hear the TT thru the Denon amp.
I would suggest looking at a TT that has a built-in preamp.
Then you would save some money and be able to plug right into your Denon.
Many online stores sell turntables that include preamp and cartridge.
Here is one example...
http://turntablelab.com/collections/turntables-with-built-in-preamp-alpha/products/audio-technica-at-lp60-automatic-turntable-pre-amp
As far as using a TT with the Denon RCD-M39s, I see there is one analogue input for an external device.
But the output level of a TT is very low and cannot plug directly into the Denon. You would need a phono preamp which boosts the volume of the TT and then plugs into the Denon amp. Now you would have a signal from the TT that is high enough for the amp to play it. Without this preamp, you would not hear the TT thru the Denon amp.
I would suggest looking at a TT that has a built-in preamp.
Then you would save some money and be able to plug right into your Denon.
Many online stores sell turntables that include preamp and cartridge.
Here is one example...
http://turntablelab.com/collections/turntables-with-built-in-preamp-alpha/products/audio-technica-at-lp60-automatic-turntable-pre-amp