App development wbs

I’m trying to study for my Computer Science course and I need some help to understand this question.

Mobile App Work Breakdown Structure

This assignment contains two (2) deliverables: a summary document to be delivered in a word processor document format and a Work Breakdown Structure (WBS) to be delivered in a project file.

Overview:

Imagine that you work as the project manager for an IT department. Your organization has recently approved the development of a mobile application. As the project manager, you will manage the development of the project. The project will include user experience (UX) design by a consultant, graphic design by a team of two contracted designers, and in-house application development by a team of three (3) programmers and a database developer.

Deliverable: WBS (MS Project or open source equivalent)

Set progress in at least ten (10) of the line items.
Set the properties so that at least one (1) of the main tasks is behind schedule.
Create a Gantt chart for the project.
Take a screenshot of the Gantt chart which can later be inserted into your written paper.
Create a PERT diagram that identifies the critical path.
Take a screenshot of the PERT chart which can later be inserted into your written paper.
Also: MS Word section

Write a two to three (2-3) page paper in which you:

Compare and contrast the information that one receives from a Gantt chart, versus that of a PERT diagram.
Examine the advantages of using a Gantt chart over a PERT chart and vice versa. Determine when it is appropriate to use one over the other. Justify your response.
Explain the importance of the critical path in project management.
Insert the screenshots of the Gantt and PERT charts you created based on the provided criteria. Elaborate on the status of the mobile application development project based on the updated information. Note: The graphical representations do not count toward the overall page requirement.