Thank you so much for all the helpful replies, I've had a look through all the links and there is some really useful stuff there. I probably should have said, I'm in the UK so not everything will apply regarding the suppliers.
I was looking at the cream legbars, some of the other breeds mentioned are harder to get here unless you hatch your own. I'd been thinking that point of lay would be better to start off with.
I am going to a fairly local poultry breeder tomorrow, they have really good reviews and a great reputation. I'm going to spend today continuing to prepare the area in my garden for them.