SEO work- keyword analysis and guidance on html structure of our web pages

we want an seo person to analyse the keyword searches in a particular city for certain services, we want it to be done for various cities and intelligent/ semantic keyword relations plus difficultly level ad competitor list etc

after that we will go ahead with html optimization page wise to do the seo work, google web master listing etc to make seo work for our site

we are html experts but need seo advise side by side to keep website in good ranks

it is a long term work