Develop the plan in stages. You can learn a lot by observing the land at different times of day and during the seasons. you cannot learn everything about a piece of land this way, but it will help.
Establishing a relationship with land takes time even seasons. There are more details about this in the "Design" chapter of my book; "Radical Regenerative Gardening and Farming", due out in January.
Once I have a plan in place I start by building a compost pile where trees will eventually be planted. Plant beds with annuals that will later become perennials. This way the beds are dug at least twice before putting into long term spaces. You also want to establish your water system. If that involves a well and irrigation, you will want to get the construction out of the way and you will need it to water. Fencing will need to be set up if there isn't one. Remember the gardener and the garden grow together.