Discovery flights are a chance to see aviation up close without making a commitment. Ask yourself, is this something I like enough to spend $6k plus all my free time for the next 4 months on in order to achieve the most basic certificate? A lot of people say "yes" and an equal number say "no". You can take discovery flights on small helicopters and gliders also. It is money well spent if you are unsure if the investment in further training is worth it for you. I could also see taking a few lessons before deciding the issue as well, since one short flight may not be enough to adequately explore the subject.

If you decide flight training is for you, then the questions you will ask are of a different variety and we can deal with them later. For now just try and have some fun and think about how this fits into your life goals. For now just ask things like how can learning to fly enrich my life, and see what they say.