how to fake a camera shake in After Effects

Anything is possible. It just takes a little imagination. To "shake" the camera, use the wiggle expression on the camera's X, Y, and/or Z axis (depending on your preference) (Or keep the camera still, link/parent all of the shots/layers to a null, and wiggle the null)
Adding a shot into a moving shot may take some keyframing and/or motion tracking, again based on your preferences. But it can be done. There are many different variables that can make up the shot, again on personal prefs, that can dictate whether a smaller or larger keyed shot can be used in a larger/smaller shot. Use your own discretion. Everything depends on your tastes as an artist.
Create a light and change light settings
A light layer can affect the colors of the 3D layers that it shines on, depending on the light's settings and the Material Options properties of the 3D layers. Each light, by default, points to its point of interest.
Lights can be used to illuminate 3D layers and to cast shadows. You can use lights to match lighting conditions of the scene into which you are compositing or to create more interesting visual results. For example, you can use light layers to create the appearance of light streaming through a video layer as if it were made of stained glass.
You can animate all of the settings for a light, except for the light type and the Casts Shadows property.You can specify which 3D layers a light affects by designating the light as an adjustment layer: place the light in the Timeline panel above the layers on which you want it to shine. Layers that are above a light adjustment layer in the layer stacking order in the Timeline panel do not receive the light, regardless of the positions of the layers in the Composition panel.
Create a light
Choose Layer > New > Light, or press Ctrl+Alt+Shift+L (Windows) or Command+Option+Shift+L (Mac OS).
Note: By default, new layers begin at the beginning of the composition duration. You can instead choose to have new layers begin at the current time by deselecting the Create Layers At Composition Start Time preference (Edit > Preferences > General (Windows) or After Effects > Preferences > General (Mac OS)).
Change light settings
Double-click a light layer in the Timeline panel or select the layer and choose Layer > Light Settings.
Select Preview in the Light Settings dialog box to show results in the Composition panel as you modify settings in the dialog box.
Light settings
Light Type
Parallel emits directional, unconstrained light from an infinitely distant source, approximating the light from a source like the Sun. Spot emits light from a source that is constrained by a cone, like a flashlight or a spotlight used in stage productions. Point emits unconstrained omnidirectional light, like the rays from a bare light bulb. Ambient creates light that has no source but rather contributes to the overall brightness of a scene and casts no shadows.
Note: Because the position in space of an Ambient light does not affect its influence on other layers, an Ambient light does not have an icon in the Composition panel.
Intensity
The brightness of the light. Negative values create nonlight. Nonlight subtracts color from a layer. For example, if a layer is already lit, creating a directional light with negative values also pointing at that layer darkens an area on the layer.
Color
The color of the light.
Cone Angle
The angle of the cone surrounding the source of a light, which determines the width of the beam at a distance. This control is active only if Spot is selected for Light Type. The cone angle of a Spot light is indicated by the shape of the light icon in the Composition panel.
Note: In After Effects CS6, a selected spot light's cone can be extended to the point of interest.
Cone Feather
The edge softness of a spotlight. This control is active only if Spot is selected for Light Type.
Falloff (After Effects CS5.5 and later)
The type of falloff for a parallel, spot or point light. Falloff describes how a light's intensity is lessened over distance.
For details, tutorials, and resources about light falloff, see this article on the Adobe website.
Falloff types include the following:
None
Illumination does not decrease as the distance between the layer and the light increases.
Smooth
Indicates a smooth linear falloff starting at the Falloff Start radius and extending the length specified by Falloff Distance.
Inverse Square Clamped
Indicates a physically accurate falloff starting at the Falloff Start radius and decreasing proportionally to the inverse square of the distance away.
Radius (After Effects CS5.5 and later)
Specifies the radius of falloff from a light. Inside this distance, the light is a constant light. Outside this distance, the light falls off.
Falloff Distance (After Effects CS5.5 and later)
Specifies the distance a light falls off from a light.
Casts Shadows
Specifies whether the light source causes a layer to cast a shadow. The Accepts Shadows material option must be On for a layer to receive a shadow; this setting is the default. The Casts Shadows material option must be On for a layer to cast shadows; this setting is not the default.
Press Alt+Shift+C (Windows) or Option+Shift+C (Mac OS) to toggle Casts Shadows for selected layers. Press AA to show Material Options properties in the Timeline panel.
Shadow Darkness
Sets the darkness of the shadow. This control is active only if Cast Shadows is selected.
Shadow Diffusion
Sets the softness of a shadow based on its apparent distance from the shadowing layer. Larger values create softer shadows. This control is active only if Casts Shadows is selected.

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