That being said, the app you are used to making your flyers with is mostly a template based app, but Pixelmator is a more a build-from-scratch app, that doesn't mean you can't import templates from the web (look up free flyer templates PSD, PSD just stands for PhotoShop Document.)
To get yourself started in Pixelmator Pro, take a look at this tutorial: https://www.pixelmator.com/tutorials/vi ... mator-pro/ and, actually just watch all of Pixelmator's videos
Also, feel free to ask any questions here, this is a great friendly community and someone will always answer your question!