Anthony,
I don't have direct experience with pulmonary valve issues, so my input will be more general. Most valve conditions, if detected early, can be monitored - sometimes for many years, before any surgery is called for. The docs will watch (via echo-cardiogram, aka ultrasound) the function of your valve. While your condition is graded as "moderate" they will check it only periodically, perhaps annually. As the severity of your condition progresses from moderate toward severe, they may check more often. Once you pass the "severe" markers and are headed toward critical, they will most likely check at least twice a year and also recommend a surgical consult. Through all this, if you start to demonstrate symptoms such as shortness of breath, fainting, chest pain, etc., they may accelerate their recommendation toward surgery.
I am describing this progression so that you can see that at the beginning, nothing seems to happen very quickly. Most mild or moderate valve issues progress slowly. We have a saying around here that ". . . The worse your valve gets, the faster it gets worse." So it is quite possible that it may be a number of years before you get to the point of requiring surgery. I don't know much about pulmonary valve issues, so I can't say if your condition has any potential to remain stable for extended periods of time or if it is destined to progress. My own condition was aortic stenosis, which ordinarily progresses at an unpredictable rate - if it progresses at all. Some percentage of aortic stenosis patients never need surgery - but I'm not aware if that could be the case for your condition. This would be a question for your cardio.
The basic cardiac surgery model can be described in a matter of fact manner. The docs have statistics on your likelihood of death without surgery, at your present statistical condition. They also have the stats regarding operative and post-op death probability. As long as your probability of prolonged life is better without surgery than with, they will wait. I ended up waiting about 9 years, from diagnosis to surgery.
Welcome to the family here at vr.org. Stop in whenever you can. Ask all the questions you like. The folks here have a wealth of first-hand experience, and they are very willing to share.