You will need to learn how to model, rig, and texture and animate in Blender, before you will be able to import anything into any engine.
There is no step by step for Game Guru till your have your model ready in the first place.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.