Career progression in the field of IC or IA ? What is the scope and how to progress? Is working in external audit better than internal?

The Best way to be a good internal auditor is to improve your KSA:

Knowledge: by keep reading and updated with continues professional education and obtaining professional certificates (Cs). Also I'm recommending visiting the following website to download useful eBooks (WWW.BOOKFI.ORG)

Skills: Communication skills and Analytical skills are the most important skills to improve.

Abilities: MS Office - IT overall understanding - Awareness of Governing laws and regulations.

Career progression is the field of IC. This plays a vital role in any industry. Human asset is the key to control and progress of all businesses. Management should continuously review the career progression and keep track of the market strategies that may include but not limited to salary and benefits survey of the competitive industry and protect their staff from pouching.

Audit and compliance department in today's world has become important functions. One should attach him / herself with academic courses with upto date refreshers and shall also try and become part of a foreign / MNC set up / Company.

Check www.theiia.org

Regarding he2nd part of your question, yes, of course ! as you enjoy the feel of independence while at the same time following the international standards.

Internal Audit have their own value than external audit, it is observed that  in the end external auditor doing job of finance or  internal audit department , so if u take start with internal audit with then you will get whole company knowledge of  operations as well as financial and also work on both areas and third thing is in implementation of internal controls , internal auditor find weakness in internal controls and management is responsible for implementation of internal controls. 

under the supervision and suggestion of my senior i will learn about many things even i am fresh graduate