MDX Resources

Books

Delivering Business Intelligence with Microsoft SQL Server 2012 by Brian Larson

(See http://www.mhprofessional.com/product.php?isbn=0071759387# for purchase options and details). 

Read Chapter 11, "Writing a New Script—MDX Scripting"

Read Chapter 12, "Pulling It Out and Building It Up—MDX Queries"

Pro SQL Server 2012 BI Solutions by Randal Root and Caryn Mason

(See http://www.apress.com/9781430234883 for purchase options and details). 

Read Chapter 14, "Reporting with MDX Queries."

MDX Video Series/Playlist To Supplement Book

Links 

Here are several links with helpful information about MDX fundamentals and concepts: 
Basic MDX SELECT Statement Syntax Fundamentals

Comparison of SQL and MDX Concepts

Packt Books Quick Start - Writing Your First MDX Query

SQL vs. MDX Queries

Using the MDX Browser Tool

SQL Server Central's Stairway to MDX Series

Database Journal's MDX Essentials Series, Part 1

Database Journal's MDX Essentials Series, Part 2

Database Journal's MDX Essentials Series, Part 3

Here are several links with helpful information about SSRS and MDX:

SSRS Overview

Creating SSRS Reports Using MDX 

Code Project Article Simple-SSRS-Report-using-MDX-Query

Code Project Article Create-First-SSRS-Report-with-SSAS

Prashant Mishra's Blog On Creating SSRS Report Using SSAS Cube

Wise Owl Using Reporting Services Series, Part 1 

Wise Owl Using Reporting Services Series, Part 2

Wise Owl Using Reporting Services Series, Part 3 

Microsoft SSRS Tutorial SQLS 2012