Hi ,
I am an electronics engineer by profession and looking forward to have my own setup so kindly help me a bit what business can I start with small investment .

Just some ideas off the top of my head:

1. Consultant for other companies
2. Work from home repairing or setting things up for people and companies.
3. Website that gives advice and opinions on matters/issues that you are knowledgeable about.

To help you further, we'd need to know exactly what type of work you are interested in doing or speaking/advising about.