How to use steel components

[Gary_Swanson]

I need to draw a structure made of steel I-beams and columns like in the pic. I have never used steel before and I'm having trouble figuring this out.

Is there a video I should look at or could someone tell me the basic's of what to do to use steel components. I need to be able to use steel for the rafters and

set a pitch. Any help at all would be appreciated.