The said lawyer first of all will be able to
1. Access necessary records on your behalf.
2. Give a considered view as to whether the criminal (even Civil case) case is at all made out of not.
3. Take complaint from you and file before Police/Court.
4. Follow up the case.
5. Attend hearing.
6. To convey you the progress/ hurdles.
7. To convey you the dates on which you have to be present in India.
However, your presence will be absolutely essential for deposing your evidence.
You can file in person but have be available for day to day progress of the case.