In addition to the options in Mission Planner, you can follow these “standard build” topics to eliminate a lot of the guesswork in a new build. Use the components suggested with as few substitutions as possible. The tuned parameters are available for download.
ArduCopter 7" Long-Range Standard Build - Blog - ArduPilot Discourse
ArduCopter 5" Long-Range Standard Build - Blog - ArduPilot Discourse
If these suggestions are not satisfactory, then it’s possible that ArduPilot is simply not the best choice for your application. There are indeed more newbie-friendly experiences available in iNav, Betaflight, or similar with the likely sacrifice of flexibility and/or extensibility.