This looks like a complete system design. I can give you appropriate angle sizes for the trusses as this question, but there is much more to this (as your question goes into some of it), which I can address as an additional service, if you're interested.
I'm not allowed to discuss cost in the chat, but I can submit the offer for you. It would be a complete roof system, including the truss, connections, metal deck, posts, and sonotube footings (the footings will be sized for gravity load only, not lateral loading)
It will take a couple days to go through the entire design and connection calculations and sketches, so if you accept the offer, I will post the results for you on Wednesday evening or Thursday morning.
I haven't submitted the offer yet. Do you plan to support every truss with a post or on beams with posts spaced less frequently?
Then as long as a door doesn't exceed 8', the door locations will not matter.
Yes, I would add the size of that beam. Let me know if you decide to go forward.