You can set a preference in Pages to always open a new document in a particular template instead of from the template chooser.
Choose Pages > Preferences (from the Pages menu at the top of your screen).
Click General at the top of the preferences window, then select “Use template.”
The first time you set this preference, the Blank template is selected. If you changed this setting before, the last template you chose is selected.
Do one of the following:
Use the currently selected template: Verify that the name of the template you want to use appears after “Use template,” then close the preferences window.
Choose a different template: Click the Change Template button, click a template, click Choose, then close the preferences window.
You can still open a new document with a different template. Hold down the Option key, then choose File > New from Template Chooser (from the File menu at the top of your screen).