Step by Step Learning FPS in Unity

Step1: create a new unity project

Step2: On top -> Assets -> Import Package -> Character Controller, then you import

Step3: On your project -> Assets -> Standard Assets -> First Person Controller, drag it into the scene

Step4: Create a Plane as floor and light source
- On top -> Game Object -> 3D -> Plane
- On top -> Game Object -> Light -> Point Light

Step5: Control your FPS using WASD and mouse hover to look around

Advance
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Step6: Download free FPS kit package(118 MB)
http://www.bigrookgames.com/files/freeFPSkit.unitypackage

Step7: import into your project

Step8: drag the Assets-> Player into your First Person Controller

Step9: In your scene, First Person Controller -> Player -> RootGo (disable the mainCameraRoot)

Step10: Drag the First Person Controller -> Player -> RootGo -> Weapon Camera Root and place it under your main camera, set the x to 0, y to -0.5, z to 0

Step11: change the First Person Controller -> Player (tag to untagged)

Step12: add rigid body to your First Person Controller , disable gravity in rigid body

Step13: under weapon camera, disable mouse look script

Step14: in Player , disable the mouse script, disable the rigid controller script

Step15: on top, edit -> project setting -> input
-> create new input fire
-> create new input aim
-> create new input switchweaponmode