Not sure if I'm understanding your question correctly, but have you done a Google search or have you tried Google's keyword tool?
Hello Friend, Keywords are the most important, You can select your keywords from this tool https://adwords.google.com/select/KeywordToolExternal.
for better performance, suggest you go for this 2 . It provide free trial. marketsamurai.com tools.seobook.com
The link given by Monishka is a beautiful tools by google for keyword tracking or you may try wordtracker's keyword tool on trial basis.
wordtracker's keyword tool is not bad, tested before this. But still prefer marketsamurai as it is more user friendly for me.