pepperbelly : Since you admittedly are new at this and do not have a lot of fit knowledge, I'd start with the saddle in a neutral position. Position the saddle (fore / aft) in the middle of the rails and level to the ground. If your frame size / stem length are correct for your physical dimensions and your range of motion, then your "center of mass" should land (roughly) in the correct location when the saddle is mounted in the center of the rails. And although many people prefer the saddle slightly nose-up or slightly nose-down, level is usually a good starting position for most people. From there, adjust the saddle height to a point where it feels slightly too low with a noticeable bend in your knee at full extension. You still want to be able to extend your leg comfortably at the bottom of the pedal stroke, but you want the saddle low enough so you can really feel your foot fully engage with the bottom of the pedal stroke. The lower saddle height should promote hip stability and a flat(er) foot at the bottom of the stroke.

Go for a ride at low intensity and see how the position feels after 10-15 minutes. What feels "low" at first might start to feel pretty normal after you ride a little bit. If after 10-15 minutes the saddle height still feels too low, raise the seat height a few millimeters and ride another 10-15 minutes. When the saddle height is too low you will feel stress on the knees and/or it will feel like a struggle to get over the top of the pedal stroke due to a closed hip angle. Repeat until you reach a seat height that feels slightly too high. When the saddle is too high you will feel like you're losing engagement at the bottom of the pedal stroke and/or your hips might start to rock to the left and right as you pedal. You might also start to feel too much weight on your hands, as the taller seat height can push you forward onto your hands. It's important to develop an awareness of how your body responds as the saddle height changes. Once you identify what's "too low" and what's "too high" you can start to experiment within that range to find what's "most comfortable".

Why start with the saddle height at the low end of the range? Because the consequences of a saddle height that is too low are much less compared to a saddle height that is too high. It's simply a "safer" starting point.

If you're not finding any comfort at any height when the saddle is level and positioned in the center of the rails, then you have other things going on with your fit that need investigation.