A great way for a user to confirm that the program will work on their computer is for them to be able to run the tests that you built for it. You have tests, right? How do they run them?

Mark some tasks or issues as pair programming tasks. This means that when someone tackles it, they’ll have an other person next to them to give them feedback and thoughts.

Mark some tasks as mentored, indicating that a newcomer can tackle them, and that there will be someone available to help them out with any questions they might have.

How do new users get started using your project? What about contributing to your project?

If you want people to report bugs on your project (and you should!) you should tell them what kind of bug reports you want. This will also encourage more thorough reports.

Think about adding bitesize tasks to you project that might be easy for new contributors to pick up and fix. Simple things like “fix link on page y” will prove a great entry point for people on your project.