There is a doc on https://docs.mendix.com/howto8/mobile/native-mobile
Since you are starting out, you best use the most up-to-date techniqueTry the Blank Native Mobile App of Mendix 9.0.5.
We can help with bugs and problems you run into, but you will have to be describing specific problems you run into (one per question) and hope someone gives you any usefulpointer.