People have differing opinions about humidity. Birds on their nests aren't "dry-hatching," and the heating element in an incubator makes things desert dry. As a beginner, I'd go with basic humidity. I'm a little lower than some people (40% and 50-55%) but definitely not going to dry hatch. Two problems I don't want to deal with is a cramped egg (too much air) and shrink wrapping when they pip.
Before you set any eggs, I suggest you get the incubator running and experiment with the humidity. One way I can tell that things are right (for me) is that during lockdown there is just a wisp of condensation on the viewing window. In my styro incubator, that means the #1 and #2 channels filled, a wet sponge in the incubator, and one of the red plugs removed (ventilation during the hatch is important). If you can get that happening and then take a humidity reading, that will give you a target for the hatch. I suggest you take it down 10-15% for the 14 days of incubation, which for me means the #1 channel filled only and one plug hole half-covered.
No personal experience (yet!), but muscovy eggs are reported to be hard to hatch in an incubator, probably because it is such a long incubation and it's hard to keep things exactly right the whole time. I'm planning to let my girls brood eggs in spring. On the other hand, quail eggs are very forgiving, so best for you to start with those IMO.
