I just got a new client (yay!) who has a 2-year-old neutered terrier mix (Schnauzer and Border, that should be interesting). Dog has really not had any training at all. Their main issue is that he door dashes. OK, I can work with that.
But I'm quite sure I will have to start with Ye Olde Basics of sit and down and stay before I can progress to the door dashing. I was thinking Simple Sit, Guided Down, Mine. And then incorporate the beginning of the door work with these. They have already told me they expect several sessions, so they don't have any expectation that I'm going to "cure" him in 1 lesson, thank goodness! Sound OK? Oh, and he's not been on a leash either in 2 years, apparently. I'm guessing they must just let him out in the yard. Whee! 
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It sounds good to me! But remember, I'm not a pro.
I would add Place to that. It has the great thing of being easily defined (since the bed or mat has distinct boundaries) and is easily reinforced. Having that much distance between the dog and the door is a godsend if you have a door dasher, and it easily becomes habit to go to the bed if someone walks to the door.
Definitely will work in some Place. 
Yea body blocking can help tons for door work and even if you don't have great sits or down, yet, working "crazy" door while on leash can help til they have more skills.
My folks dog is/was a horrible door dasher - especially out of the car. She would just drop her head and push on the door the minute you opened it. Zoiks. We ended up having to work the "crazy door" game right away, so we changed her behavior before we even got home with her. She knew sit/ down etc, but we could not enforce that from outside the car - so did not use that approach. She figured out pretty quickly that these new people were nuts, and she had better wait for a release so she did not get a door back at her, or get firmly pinned part way through. We had to practice again with the front door at home - she would try to hook a paw in it and pull it out of our hands. Strong and smart girl.
In my non-expert opinion, your plan sounds good. I just would preclude working on door control from the first day. Maybe set up an expen barrier outside the front door? We kept a leash on Olive so we could grab her, but she is tall and it was not super risky where we were.
Good luck!
I don't have an x-pen, but I do have a long line, so I can use that in case he gets by me. Thanks!
Hmm - I realized an edit would have been useful
What I meant to say is ...I think you can work on the crazy door game right away and work on other commands in parallel. One does not have to come before the other. I imagine what will be difficult is having the family be solid on following the door rules so the little guy can't practice door dashing more. We had to be very dilligent with Olive until she gave up and decided that we were not going to fall for her tricks and in fact we were quite unpredictable at doorways 
so she had to stay back.
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