Again, I don’t have any experience on making gantt chart for a company, but I have made gantt chart for my capstone class. I think the first thing to do is the set up the start date and the end date of the project. After that, you should find out what the critical tasks are. When making the gantt chart, give as much time as possible for each tasks, and then adjust the time based on what you think you can finish the tasks by. Also have extra time available at the end, so that if you don’t finish the project by the due date, you still have some time to do the task.