Your first task is to create a project plan for the Board of Directors in Microsoft Word or Excel. The project outline is essential for documenting all of the necessary tasks and milestones necessary to complete the project. The project is expected to take 18 months to complete, and the major milestones are broken up by quarters. You will need to be creative and develop the following items as if you were running the project.
Include the following (you will need to create these items):
    tasks and milestones;
    a project description;
    key stakeholders;
    timeline for the project.

In the Project Description dont forget the length and cost of the project.
The easiest way to identify the Key Stakeholders for this brief paper would be to use a table. You simply could have their position and name. Remember, this is for a specific project with actual people. Who are these people? The table should be limited to those who can make or break the success of the project. Certainly, the acquisition will affect a number of people, but only a few are in the decision-making position. The rest will be sent a notification of intent/progress/completion. There are probably 8 to 10 specific people who will sit at these meetings.  Take a look at https://bizfluent.com/info-8397448-key-stakeholders-organization.html
The Task/Milestones need some work. They are to be an actual list of major milestones and specific tasks broken up by quarters. These may change over the 18 months, but specific tasks should be aligned with quarterly Milestones. A table could list these individual items and line them up with the Milestone. Google images for project task list template
Note that a task is different than a milestone. A milestone is a reference point that marks a major event in a project and is used to monitor the projects progress. It is usually used to indicate when a specific phase or group of tasks is to be completed.  It can be considered a deadline date. You could include them in the same table if they were noted, maybe with a color scheme or a separate column. Google Tasks vs Milestones.