how to make my character wall jump(run)

Basically, I want my fps character too jump, and when I hit a wall, if I press jump again, he will boost himself up the wall. And if when I jump, hit the wall, and press left/right, je will boost himself in that direction. And if its possible, I would like my character to cling to the wall, so I can chose the direction I want to boost in. I am using the basic first person controler you get with unity. I am using java script and I am very new to it , so could you please tell me how to do this step by step?

Thanks! :D