MoneySavingExpert.com is a one-stop-shop for everything you need to help you manage your money and get the best deals. The website has money-saving guides, tips, tools, articles and a forum covering everything from mortgages to credit cards and loans.
A good starting point is the Money Makeover guide which will help you cut your bills, then sign up for the weekly email to get the best deals and keep on top of your money.