You can make your career in Tamil story writing. You have done computer so type your story in the word file and save in pdf format. After making its pdf there are many scopes;
1. Publish your own book and sell in the market. You will get Royalty for the lifetime.
2. You can publish your book in a form of an e-book and can sell on different shopping sites. Flipkart, Amazon, etc will automatically advertise your book to the readers.
3. There are some sites which publish attractive e-books on nominal charges, you can take the advantage of it.
4. If you any publisher, directly contact him, he will see your story and can publish.
5. I will suggest you make your site or blog and submit some stories there, people will be familiar with you and you would be able to recognise yourself as a good story writer. The reader will eagerly want to read your story.
6. Publish your some story in local Tamil newspaper for advertisement purposes.
So, these are some tips to make your career as Tamil story writer.
Honesty is the best policy.