Headphone AMP/DAC to Mixer

Hello Everyone,

I am about to upgrade my audio before I do I want to know if there will be any problems and how to do it.

I am planning on buying sennheiser hd598s, the schiit stake (modi and magni) amp/dac,
Behringer Xenyx 802 Premium 8-Input 2-Bus Mixer with Xenyx Mic Preamps and British EQs, and an audio Technic AT2020 mic. I am wondering is this possible to do and can I have my voice come through the headphones so I can monitor my voice and change the levels on the mixer to where I want them to be.

Are you a musician or something? Just wondering about the XLR mic and the soundmixer. If you're trying to record music I can see the need, just wanted to make sure that you're not flushing money.