Let me explain it step by step.
1 - i have a customer
2 - My customer building a homepage for job search site
3 - He needs SEO because fresh start web site need visitors
4 - He asked me if i can help or not.
5 - I post a topic here seeking professional SEO help.
It is tough to bring your website for a single keyword because there is lot of competition for Single word keywords.
The second think is single word keyword won't make much business for you, let us take your keyword "high income" first you need to relate your keywords with your business. If I'm looking for a high income job in japan then i use keyword like "high income jobs in japan" in Google to find a website.so you need to target your audience with your keywords.
Single keyword will not help in building page. You must think of another relevant keyword to link your site. I agree with goodluckdomain there is lot of competition for a single keywords. You must do some advance techniques to achieve top page like what we do in dominatetoppage dot com.