Adding a turntable to my system

Your Marantz AV7005 does NOT have a built-n phono stage, so you will need, in addition to the turntable, an external phono stage.

BTW, the Debut Carbon is an excellent starter table.  It doesn't have a phono stage inboard, but most of these within the table itself aren't that good.

So to recap you will need:

Table
Arm
Cartridge
External Phono Stage
Interconnect cable from phono stage to AV7005

Most of the time the Debut Carbon comes with a pre-installed 2M red cartridge.

I've owned a Debut Carbon, an overrated table IMO.
  
Consider the Rega P1 turntable. For Phono preamps, it's tough to beat the Schiit Mani or U-turn Pluto at $100 and $89 respectively.

They both sweet table for starter ,both come with MM cartridge so you only need phono stage.
me recommends phono with MM or MC input,cause one you try MM that comes with it you wanna hear what people's buzz bout MC !
also need cable from phono to marantz.