Predictive Forecasting Tool

Hello, 

I'm looking for some guidance on how to setup some sort of predictivite forecasting tool in Power-BI, however, what I want is something like the following: 

Data source - Excel file

I am looking for something where: 

Case-Type A: 57 minutes

Case-Type B: 26 minutes

Case-Type C: 20 minutes

etc... 

And I want to use sliding slicers where I can slide the incoming case volume up or down (i.e. 100 cases of A to now 200 cases of A per day, etc.), and it will tell me how many hours total I will need to work all these different case types total.  

How would I begin to set this up?  I wouldn't think it would be too hard, but I'm not sure?  Never tackled anything like this before...