Question 1: How do we get started with Data Marts ?

Get a broad understanding of the Users Data Requirements.
Establish a common view of the Data Platform
Determine the available Data
Reconcile standards and Reference Data.
Choose the product or use bespoke SQL.
Use Templates and agree design with Users.
Populate Templates with sample data.
Get sign-off on demonstration specifications in 1 months
Aim for results for User champion in 3 months and final results in 6 months.
Adjust timescales in the light of experience.