Just create a form with required fields. Create a Page for example create a page with name Home and then add the short_code of the form that you have created using contact-form-7, and then go to the wordpress settings menu in the wordpress admin and from that select reading and then from there you can find frontpage display settings from there you can choose the option which ever you need. For our solution you need to select the page with the form as to be displayed as front page. See it Here
Hope this helps you