anyone knows how to make the movement of gameplay like Flappy Bird in Side scroller? do I have to do animation or simply use the blueprint?
It depends on what exactly you want. When you just want the movement, then you can use your blueprints, otherwise, when it should also play an animation, you will have to create some sprite animations first 
Just take a look at the tappy chicken project which you can find in the learn tab of the launcher (it’s a clone of flappy bird) ^^