Google provides a number of templates that you can use to form the basis of your slide presentations. You can create a new presentation based on a template, then edit the slides as required. 

To create a slide presentation based on a template:

Choose the General tab for standard Google templates, or your domain tab for custom templates for your organisation. Click on the template you wish to use to create a new presentation based on that template.

Once the new presentation has been created, you can name the presentation by double-clicking on the presentation name and typing a new name.