It is not complex and honestly I have no idea how to improve in it or win...
You pick your allegiance (Joe or Cobra), then your character (three choices - SE, Duke, Scarlett or Neo-Viper, SS, Baroness). Then you "deploy" and fight a random opponent. You can go in and customize your toon after you earn points. I played until I lost 20 fights then exited. When I returned nothing had saved even though I clicked "save".