adding an atrium to my house

:) Hi,
I have owned 2 Eichlers in my life, but have now moved
on and have purchased a contemporary/ranch style of home.
I miss the Atrium living space and would like to put an Atrium
addition to the front of my current house. Currently the area
in question is just a large courtyard. Any suggestions such as
contacting a landscape architect would be great. My fiance and
I are considering doing the labor ourselves. We would need the
plans drawn up by either an architect or designer.
Not sure who to contact for this.