Move website from Squarespace to Wordpress

I have a website at www.transformat.co.uk which is currently in SquareSpace but I would like it to be moved over to WordPress. It's a 6 year old site and hasn't been changed in that time so looks very dated! I don't need any content to be changed or pages added, but I want the background to be white with black text, instead of the black background with white text as it is now. I will arrange the hosting when the re-design is complete. Thanks, Chris