This is by now pretty old, and in UDK, but there are a ton of good tips.
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This is by now pretty old, and in UDK, but there are a ton of good tips.

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How to import your own custom textures into UDK. Tutorial covers how to import a diffuse, a specular and a normal map textures.
This is for UDK, but it solved my problem in UE4.
Some links to start off
Polycount
PS Textures Plugin
Unreal's Tutorials
UE4 Documentation
Fragoria FX Reel
Geoff Lester's Vector Fields
Max Script Vector Fields
Autodesk Area
Intro to Explosions