Many journals do not have resources to purchase web hosting plans. Before they make decision to move forward, check what is good for them, what to put in the project proposal to donors it is highly recommended to check web platform such as OJS on your local computer.
You can use one of popular prepacked and configured platforms such as XAMPP which will let you install OJS and check it how it works. You can download OJS and install it. There is a plenty of resources on using XAMPP on YouTube.
Install it and ask people on forum to help you to learn more about the system. I know people who have had positive experience with checking some platform locally before going fully on-line. When I work with editorial boards I always suggest and help them to install it locally and then with better insight and proper planning to conceptualize their OA publishing policy.
People who planned on line use of ATutor and/or OJS in my experience benefited a lot from checking those applications locally. Do not be shy, move forward and ask for help. Asking is not shame. That is core of community support!