Re: New biker in ID
What you've bought there is a very common kit. You'll find folks here who are familiar with it and who'll be able to offer advice when you have trouble.
As far as accessories are concerned the best advice I've seen here boils down to 'leave it stock' until you've mastered it. Until you've come to understand the engine and drive trains strengths and weaknesses and can maintain your bike by yourself. The good news; it's not all that hard.
Brake lights and turn signals aren't going to hurt, by any means. But most of us have no trouble with the police simply by riding as though we're sober grownups. That seems to be all that law enforcement asks of us.