carport add on

[Gym]

I have a gable end carport that I would like to extend in length...the inexpensive way is to add a shed type addition attached by some type of header to the gable end...gable span is 14 feet and height to bottom of truss is 13.5 feet...I plan on adding another 12 feet in length with a pitch of 5/12...I think I am OK with footers, piers and posts for the addition but am concerned with the header, I don't plan putting another set of posts on the gable end for the header and want to know how and what kind of header I need...the span from the gable end post (6x6) to the 1st support post on the add on shed type is 6 feet also a 6X6 post...any thoughts or help is appreciated in advance if this is at all possible, thanks