What you are willing to accept in your breeding plan is up to you.
Remember, the goal is to create a better bird next generation. So, look at the negatives and positives of both the male and female and see what they can correct or what they may make worse. Honestly, if both male and female have a narrow back/body, I wouldn't breed them together, you will just get more of the same. Each breeding should either be complimentary or should enhance an already good quality.
If you have only one male, he may not be suitable for every female you have. This is where you have to analyze each bird and see how they might work together. Being this is your first year breeding these ones, you may see things next gen that make you ask "WT-" happened there?! You won't know until you start breeding. Somehow identify who the parents are, many of us use a toe punch, which is easy to do. Breeding is a numbers game and the more you can get out the higher your chances of moving forward, but be picky.
In 2014, I didn't keep a single male that I hatched. I had no regrets, each of them had something I was not willing to accept in the flock. When you are starting out though, it is tough to make those decisions on what you are willing to accept, especially when your options are so limited.
So, my advice, pick the ones with the least faults who will compliment each other. It might only be a trio, but hatching every egg they give you and see what results you get. You might get a couple worth keeping. In the meantime, keep trying to get better stock to build from. I will be trying to get some stock up to Canada this year, and I think Shumaker said the same. For now though, ask yourself what you are willing to allow and what needs to be eliminated and go from there. Only you can make that call especially since you are the one who can put your hands on the birds and feel what they are and open their wings and such to examine them thoroughly.