heads up, learn a basic workflow to import content into blender, assemble and export to unity. It's free and it'll take you a day or so to learn, but it'll literally save you hours each time you need to work with new content.
if that's a real question, the answer is that you will need to duckduckgo some tutorials. Unity has a large community. Also, there are premade game engines that do most of the work for you like uMMORPG
