Your website is complete, and you have the time to update your website. An exciting time! Pie Design provides a folder of training videos of how to navigate updating the pages of your website, enter the back end of the site to update plugins, or WordPress core code, and how to upload images or media. There is also a documentation website with plenty of resources to read about.
Wanting to help and extend support, you can always contact Pie Design with any questions you may have.