YANBU. I will tell you what NOT to do, and then tell you what you can do.
This happened with us - everything we were dreading happened. Barking dogs, music, blocking the driveway, etc. I totally lost my temper, involved the council, the police, yelled over the fence that I was going to poison the dogs, and did this multiple times until something was done about it, and eventually confronted the main fucker by going ballistic in his face, toe-to-toe with him (I am not recommending you do this, and I am a pretty muscular woman who lifts weights for fun so I could have handled myself if things got nasty - it was a stupid thing to do). I essentially frightened him into backing the fuck down, parking somewhere more considerate and shutting up his pointless little dogs. This is not the way to handle it.
What I recommend you do - be friendly and welcoming with the neighbours, until they feel that they can't possibly be noisy and impact the life of such a nice person. You then have a gentle avenue to opening up dialogue if you hear unnecessary noise.
Of course, sometimes bad neighbours are just bad neighbours and will be selfish fuckers anyway - I tried the nice approach and they threw it back in my face, but 9/10 people are not total troglodytes like my knuckle-dragging neighbours, and will be receptive.
Shit neighbours will happen if you worry about them or not. Familiarise yourself with your rights - your council's noise pages, for example, and how you would go about recording excessive noise - do they require you to fill out a diary for two weeks? Is there a hotline you can call? Focus on what you can control rather than the bits you can't.
I really hope you get some good neighbours.