It should work normally. On the right under the map, the mission will be displayed. Keep in mind, you have to talk to the NPC, which is close to you when you spawn, in order to get the next missions. Killing enemies will give you materia, which is the blue item on the left, under the player picture. You can use that in shops. Healing is automatic - you will recover slightly every 20 sec. You can open the controls menu when ingame, by pressing ESCAPE then clicking the button. It will show you the main controls of the game, such as the different menus. Hope this helps, if you have any further problems, I will hapily assist. Also, I am working on a documentation page for the game, so soon there will be a tutorial if you get lost with stuff like this.