Full impact?

I’m not a WordPress whiz, and I don’t know much about CSS and websites. Nevertheless, I have taken the plunge and created a simple, one-page webpage.

The aim of my site:
– Informative, easy to read and navigate
– Simple and to the point. No mess, no fuss (simplicity)

Now I’ve had a look at my site on other computers and frustratingly, it appears different. Some bits are missing, whilst other pages just look ‘odd’.

I was told my header wasn’t working with SEO, and that I had no metatags …?

Please can somebody have a look at my site and offer genuine feedback, and perhaps how to fix any ‘gremlins’.

http://www.impactcopywriting.co.uk

Many thanks in advance.