Exporting archvis scenes to "max -obj- fbx- mlt- dae" for selling on cgtrader

I need some help, I am lost on how to export properly to these formats and others
if some can provide a step by step guide on how to do so
I am kinda new to blender and i am having issues with exporting in general
i heard that i need to bake textures and export uv maps, i didn’t find straight forward guides on how to do so

ps"i use mostly pbr"