Sounds like you're off to a great start with this one! Since we're heading into winter, I'd just focus on having fun and observing what you like and don't like for now. Go on longer rides, and bring allen wrenches to experiment with the saddle and stem positions. (I think I spy a witness line on your seatpost -- I do the same thing.)
Some neck pain might be normal right now since you're needing to hold you head up at an angle. Make sure you're not hunching your back -- holding it straighter lets you see ahead without needing to bend your neck as much.
If the ride is comfortable, some road buzz isn't bad. Subconsciously, it might
encourage you by making you feel like you're going fast!
