This is also my first go at designing my website in Photoshop.
Apologies in advance if this sounds harsh
The above is your first mistake. My first website (and I'm no web designer) was designed with a pen and paper, my current designs for my revised site were first done on pen and paper.
Your 'page' is actually misaligned, there's a gap in the middle (due to the left image) and the menu is too wide due to the borders.
The reason it looks too heavy on the left is the additional spray pattern making it darker and the bold menus which are drawing the eye in, there's also a huge amount of white on the right hand side.
Theres no need for the 'home setup', the only time I see system specs is when I go to a site selling stuff or supplying a service such as hosting or rendering. As a potential client I couldn't give a monkey's how you make the site as long as it looks how I want it etc.
And your text needs changing too.
Nobody will ring a mobile and you've also got the +44 wrong, its +44 (0) 7515...
I would seriously suggest looking at your competition, I'm all for starting out early but you've got to be realistic and understand just how much more you have to learn. I'll be blunt in saying that my web skills are better than yours and even I don't advertise as a full on web designer.