This is what I did in the past. Starting a lot of new sites without having a keyword in mind that I wanted to rank for... What happened with these sites? You can guess, 9 out of 10 failed. When I start a new site now, I do my fair part of research and get 2-3 keywords I want to rank for that have a decent search volume (at least 5,000 + exact). If you do this, you have a goal and will have more chance to succeed What do you do when you start a new site?
I will first do keyword research for my niche and after that proper placement of those into different pages.
I will do keyword research fisrts using google keyword tools and then find keyword with high traffic and less competition.
first of all you have to need right keyword for your website.So go Google Ad Words and research your keywords.