Suggest me low investment business

Please clarify your question.

Buy a wordpress domain, so that they will provide you a free designing templates. At low cost you will become the owner for the site. And do some promotion work for this site to get traffic. After getting some traffic you can go for "Google ads" so that you will be earning money from your site on a daily basis. Or else you just Buy the domain and sell it for High price.(choose good keyword related domain)