[lay] the groundwork

to establish the necessary foundation or preparation for a future project, plan, or idea

They spent months laying the groundwork for the new startup company.
Before launching the product, the team needed to lay the groundwork with market research.
A successful marketing campaign requires laying the groundwork with audience analysis.
The teacher focused on laying the groundwork for a strong understanding of the subject.
Planning the wedding involved laying the groundwork by setting a budget and selecting a venue.