I saw your other thread in the hire section, and think you need to pause before you spend more money.
A few simple questions. You are a small firm, no? I take it that makes your services quite local. A business like yours sounds like the sort of business that makes more from referrals than cold searches.
Why do you want a website?
Why do you think a website will make you more money?
What sort of people do you think will contact you via your website?
How will you measure the success of your website?
It seems rather redundant, but not all traffic that you will get from general SEO will be the sort of traffic you want.
SEO for, "I want everyone who searches for "XYZ" to find me", is going to be quite different from "I want anyone who need "XYZ" in my area" to find me.