Correct. Whilst reading the documentation and learn section as highlighted by Jac given you are looking not only at uplinks but potentially also
Please also get familar with the TTN FUP (wrt downlinks limits and frequency of updates on both counts). You may also find this tool useful 
https://avbentem.github.io/airtime-calculator/ttn/eu868/8
Once you have data coming into the TTN console App/Device view you just need to use Integrations to add your MQTT connection.
System reasonably easy to set up and operate if you follow the instructions carefully and pay attention to details. Have done several of them over the years and have one of the larger capacity LT-32222 units running in near touching distance here (monitoring a solar powered GW test rig) that has run happily almost continuously for >4.5 years now (LW1.0.2) on TTS/TTN V3.