I think you left off your list the item that needs to be number one.
You feel you had many failures last year. Seems to me the very first thing to do is examine those failures. You need to know the parameters of those failures in order to avoid getting caught in them again this year. From what you say, there were a couple different kinds of "failure". Why did the strawberries not work on the hugelbed? Important to understand that to avoid another similar failure next year. Was it bad placement with too little sun, too much wind, too dry or too wet, not enough nutrition in the soil? There is such a long list of possible causes for failure, you need to get the best possible understanding and then plan to avoid it happening again. This will be vital in planning your plantings, which will determine the layout of your beds.
I think it worth emphasizing, choose what you want to plant before you decide the layout of your planting. What you want to plant will dictate much of the layout, so first decide what, then determine where to plant for maximum performance of each planting.
Another mode of "failure"you mention is irritated family members. Again, to avoid in the future you need to understand how things went wrong in the past. Perhaps not enough communication, not enough involvement of others... I don't know, it is your story, but those are two areas that commonly trip people up.
Your own energy... Yeah. Hard not to get excited and try to do thirty things, as each new idea wants to come out and play Right Now! This is something you really have control over and can really manage. It leads to what I would put as number two on the list.
Planning. First, consider the parameters of failure from last year. Plan with them in mind. What do you want to plant? Why? How much? Why? Prioritize the things you want to plant. Consider the time and effort involved in doing the process of preparing and planting. Evaluate how much of what you would like to accomplish is actually realistic. Adjust accordingly. When you have the list of what you are going to plant, work with the needs of the plants to determine where you will be planting them.
You might want family members involved in this process, getting their input as to what to grow (Brussels sprouts? Eww! Maybe kale instead?) helps them to be invested in the project. Plus, if you need their help with some of the work, or just invite the help even if you don't need it, more investment on their part and better acceptance if it can be negotiated a bit well in advance. Again, your story, so exactly what to do is yours, I am highlighting some possible courses that may or may not apply.
After you have the planting plan worked out based on the needs of the plants, you may have identified some needed projects. Perhaps a
swale is called for, to hold
water high on your property where it runs in from the neighbor's
lawn. Maybe you are planning a bed of heavy feeding squash that will want some extra attention with compost and a nitrogen fixing cover crop. Whatever they might be, these items will need to be factored into your workload and the progression of building the design. It may even be that at this point you need to reconsider the scale, perhaps something needs to be dropped to keep it manageable or perhaps something you thought would not fit can actually be tucked in after all.
After you have thought it all through and layed it out on paper, then you are finally at the point of marking it out in place, and then starting in with your shovel, rake, wheelbarrow, etc.
It can be very hard to restrain the enthusiasm to get out and Do! Focusing on planning things out, thinking them through, analyzing what the different plants need, all of these things can seem like they are holding us back, keeping us from getting things done. They are not as exciting as digging a hole and planting a tree. But they are fundamental to being successful when we dig that hole and plant that tree. And knowing that the planting is being made as optimally as you know how, to give the plant its best possible chance for success and subsequent yield, that is pretty exciting
. Planning may not be its own reward, but it will surely bring rewards that would not be realized without it.