Yours is not a stupid question. According to our first experience with Low Mass, it can be a bit of a shock. It’s very quiet and that unnerves some people who are used to a lot more sound in the NO Mass. Many people come to find the Low Mass very peaceful and contemplative, but it takes some getting used to. Just make sure your expectations are in line with reality–ours were not the first time and as I said it was kind of shocking and a bit disillusioning.
I think a sung High Mass is much more accessible to the first-time Latin Mass goer. The congregation may or may not sing the responses–so you can take your cue from them on that–but the ceremonies themselves will be more detailed and of course there is the additional setting of music, hopefully Gregorian chant but sometimes also sacred polyphony.
For both, it’s very helpful to get a copy of that
thin red missal from Ecclesia Dei and just read it through. My wife and I both did that early on and it really helped to understand what the priest was doing and praying throughout the Mass. The prayers are beautiful. It’s helpful to know ahead of time too some of the cues that will help you find your place–standing for the Gospel, the Credo, the Sanctus, the Angus Dei are the major ones. As you become more and more familiar with the rite you’ll recognize additional milestones. After about ten times you’ll be pretty comfortable, I’d say.
God bless,