We're all tempted, when it comes to growing food, to go for broke. We envision growing an abundant plenty, providing from the soil what we normally queue for, cash in hand.
Hold on to that big vision. But don't burden your starting efforts with it's size. This is super important, because you will have so much to learn, there's a very high chance you will hinder your learning curve with the effort of trying to keep up with a big project.
So many of us have made this mistake and genuinely regretted it. It's so much better to tend a small patch well, than tend a large patch badly. It's so much better to make yourself a small, ongoing joy that gives back to you when life gets stressful, than make yourself a big, temporary joy that becomes another big stress when life gets stressful.
That said, it is an abundant garden that gives true resilience in the long-term, so it makes sense to make room for expansion. As your capacity grows, and you sense you can comfortably expand your efforts, you need to be unrestrained by what you've previously set up.
That's why we've focused on modular structures that are oriented to adaptability, rather than permanence. We build our garden cages (wildlife protection) in easily repeatable panels, without any specialised techniques, from readily obtainable materials. Our raised beds are designed in similar fashion, and likewise for retaining walls. All are able to be taken down and loaded onto a trailer or ute, if necessary. Its all very robust, but its not concreted into the earth. This all means that expanding in place is easy. Its also easy to shift to a new location in order to expand.
Basically, you don't need to compromise between your long-term vision and your short term need for do-ability. You can do both.