Define and help implement small company marketing strategy

General information for the business: Our business is Web Design & Development
Industry: Internet/Software
Geographical areas: London, United Kingdom
Target customers: People who need a website, web app or mobile app (See below for more detail)
Description of Business Development: We have good technical and design experience and an understanding of marketing, but lack in-depth experience.

Help us define (and perhaps implement) a targeted achievable strategic marketing plan with defined actions and deliverables.
i.e Not achieve 50% growth in 3 months.
We need a highly defined process that can be assigned and implemented to bring in work and grow the business.

Our current high-level overview is as follows:
Target the following verticals:
Engineering, Construction, Manufacturing
Fashion Design, Product Design, Interior Design, Architecture
Finance:
Hedge Funds, Oil & Gas Trading,
Commodities, FX Trading

Location:
Greenwich
South London
London
Greater London
South East England
Extra notes: In parallel we are progressing our incoming digital marketing, This consists of:
1. Cleaning up site content and SEO.
2. Sorting out keyword research to define a PPC campaign.

The first is long term and won't reap any real benefits for 3 to 6 months.
The second has the potential to be quite expensive based on our location and business area (i.e Web design in London)

We need help clarifying the above approach and also looking at more traditional forms of marketing (i.e. cold calls)


The role would be an initial once off push to get the ball rolling and then most likely a weekly / monthly remit to ensure that the ball continues rolling!