This lesson I'll try showing you how to give some speed and flame to a static car.
Find a picture with a car like the next one:

Mark out the car's wheel with the
Elliptical Marquee Tool (M) 
…then select the next selection:
Filter>Blur>Radial Blur 
We'll get the effect of rotating wheel:

Next try to give the same effect to the second wheel.

Make a copy of this layer (
Ctrl+J) and try to enlarge it by
20%, using the
Free Transform option. Blur out the borders of the doors' pole, of the backside light, of the wheels and the mirrors, using the
Smudge Tool (R) for this operation. We need also to choose for this layer the next demonstrated
Blending Mode.

We need to get the next result:

On a new layer we'll insert with the brush a blue silhouette, using the next indicated color's code:

Set the next indicated parameter:

We'll get the next result on this stage: