Answer
What is the first step in a garden project?
A consultation and a site survey, before any design or price.
In short
A consultation and a proper look at the site. Before any design or price, it pays to understand how you want to use the garden and to survey the levels, access, soil and aspect. Everything good flows from getting that right; everything expensive flows from skipping it.
Arrange a consultation
Send a few photographs and a sentence about the site. We will reply personally.