Blog post / article writing for digital marketing company

We are a digital agency and we're looking to get some help writing and publishing thought leading articles on a range of topics to do with website design and digital marketing. Topics will include

Why do my competitors beat me on Google?
What is CPA (cost per acquirement) and why should I be bothered about it?
Top 3 things all growing business are doing with digital marketing
How photography impacts conversion rates
B2B – 5 key areas your website could be letting you down
How to choose a good agency
How to write a digital marketing brief
How to write a good website brief
How much does a new website cost

The tone of voice is intelligent, helpful and non technical, aimed at Marketing managers and sales directors of UK SME's turning over £20M-100M PA. Where possible we want to keep articles under 800 words and a maximum read time of 2-3 minutes.

The key thing we are looking for is quality. The article has to demonstrate knowledge, authority and demonstrate our expertise in digital. We are only looking for copy writers who have experience in our sector.