Odd-shaped columns and beams

[FSiedschlag]

Hello everyone, 

I'm fairly new to Professional Revit and one of my projects involves somewhat complicated geometry and odd-shaped columns and beams.

I'm posting what I have modelled using Sketchup but I'm trying to run away from that software and I really want to use Revit exclusively for that. 

I've been trying to get information from the internet but haven't been much successful. Maybe I'm looking for the wrong terms or keywords. 

How should I proceed with this project? 

I know how to create a new beam family but can't seem to be able to edit the "left tip" of that beam. One of my beam corners should have an internal angle of 71º instead of the normal 90º.

How about the columns what is the logical creating process here?

[FSiedschlag]

Ok. I don't know what that is yet but I'll definitely look it up!  

Thanks again.