Microsoft Visio Gannt Chart Creation

I need someone to create a Gantt chart in Visio for me that I can't quite get to work. Here's what I need: Column 1: Task (our company's marketing promotion) Column 2: Promotion Lock Date (represents date by which the promotion has to be designed and ready) Column 3: Start Selling Date (represents the date the sales team starts selling the promotion to client) Column 4: End Selling Date (represents the date all clients must be onboard by) Column 5: Collateral Due Date (represents the day all clients must have their ad materials to us) Column 6: Promotion Start (represents the day the promotion actually starts) Column 7: Promotion End (represents the day the promotion ends) Visulation needed: I would like all of these dates to show up on one task line so we can visualize what all is being sold, when its being sold and what events it overlaps with. I use Visio often for other functions, but not Gantt charts. If you have suggestions for a better way to visualize this (either through subtasks that role up or similar), I am open to the suggestions. Number of tasks: approximately 50 Date range: 3/1/2018 - 12/31/2018 Need as soon as possible