Some Advice on my roof

[tlsapp]

There are other ways do do this, but typically there would be a girder truss where I've placed the red line, and the main 28' trusses would butt into metal buckets attached to that girder truss.

Lew is correct in stating that the truss plant will design and engineer the truss system. However, an awareness of what is possible in a truss design will help you avoid potential problems. For example, I'd bump that window under that girder over a little so the girder sat on the wall rather that the masonry lintel or the wooden header, depending on which you are using.