There's a lot of information out there on your rights and responsibilities as a tenant.
Tenancy Services is the government service responsible for administering the law around tenancies. Their website has a wealth of information, including typical rents and bonds in different neighbourhoods, forms for setting up a tenancy, and information about your rights and responsibilities as a tenant.
The website of the Citizens' Advice Bureau also has useful information on tenancy rights, as well as on how to access emergency or social housing.
The Community Law Centre website is another important resource for renters. They have advice on finding a flat, finding a good deal on a power company, and organising your finances, as well as legal issues.