To sign up to a property alert simply perform a search on Zoopla with your criteria and select 'create email alert'. You can create as many property alerts as you wish.
Use the keywords filter to refine your search for properties that include specific words e.g. garage. Just edit your alert and select 'Filter results'.
You can also search for exact phrases by using quotation marks e.g. "double garage", or to exclude a term you can prefix it with '-' e.g. -pets. Don't forget to save your updates by selecting 'change my last saved search'.