I want to start interior business, but I have not doner course for that,but I like to do tis business and I am also intersted ,so I just want to know how ca\n I start interior business how much I have to invest and what else I required

Please don't take this the wrong way but first impressions are big in that industry.

You will need to sharpen up your writing skills, some people would think does she decorate like she writes.

You probably need to get a portfolio started with your work, resume, etc. and then figure out what your forte is and focus on getting clients in that arena.

Once you get the first client (which will be the toughest) if you are good they can referr you or give you others to go to.
Just be patient, business takes time.