Do you start keyword research with your new website? Then first and foremost you have to know and select your target field and business. If you don't have any idea of your business, then its is totally worthless.
You can use Google adwords tool and Semrush tool for keyword research. These are the two best tools and give good and accurate information about keywords. There are certain parameters that require for keywords research. Choose a keywords list including long and short tail keywords. After that you check global, monthly search, CPC , search results using the Google Adwords and Semrush tool. And finally prepare a 5/7 keywords list.