Hi Liam
Firstly, only use a reputable builder, and a solicitor thats not connected to the builder in any way, if you use the search feature on this page you will find opinions from many many people who have had good and bad experiences with many of the builders and solicitors in altinkum, to be honest in my opinion theres actually very few that are perfect in EVERY aspect, for example one thats good on paperwork might not be good with aftersales.
Bobs advice on buying resale is very good advice but restricts your choice, having said that why not try all the resales first just in case you find what you are looking for, even then still make sure that all the paperwork is in order.
It can be a very enjoyable experience, just dont do anything in a hurry, and come back on here as many times as need be to check things out, theres not much going on these days thats not already happened to someone else.
good luck
martin