Sorry if I was hard on you but you are making questions that are basic and maybe you don't have the experience needed to use haxeflixel yet. My advice is that you must try another tools that are less code centered so you can make your first game with less problems.
For example, Stencyl uses openfl as Haxeflixel so the product that you can make will be very similar but it is easier to do with Stencyl.