you need only create a template for the page you want. In the template file you can insert php code as needed.
1 - First create a php file using the nomenclature "page-" + [My-Name-page], for example: page-our-team.php
2 - In the file header put the following comment to the wordpress recognize the file as a new page template:
<?php /* Template Name: PAGE OUR TEAM */ ?>
3 - Before starting with its fully custom code, test to see if everything is correct.
<?php echo "My happy custom php code";?>
4 - Save your file and go to the administration panel of wordpress. Create a blank page, and select the template you created in the screen right selection list.
5 - Test the page's url in your browser and see if your test worked.
6 - Feel free to ask if you have questions.