The roof pitch of the main structure looks like your house at 6/12 and the back roof a shallow 3/12 and might benefit from an impervious layer under the standard asphalt shingles like I did on my greenhouse roof. No big deal to do with the new coated and taped joint system. In fact you will probably use the same system for the whole structure. I like the draftsman plan.
Jennifer, the reason this is important is that a portion of our garage room may not be very steep at all (referred to as something like 3/12 pitch).
When your roof is not as steep you have to me more careful about water and wind damage.
As a note to myself I'll read these two links discussing applying asphalt shingles to a low slope roof:
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