Hey beginner with questions

I have recieved through inheritance an old 1977 Yamaha 400, i am hoping i can convert it into a street legal bike. The previous owners seemed to have thought the same, it has blinkers and flood lights. I was wondering what my options are for converting this bike to sreet legal status. Also any sites that would offer low price parts would be great.

oh, and the only problem is it is too loud, i need a quiet cheap exhaust.

Consult with your local Department of Motor Vehicles. I take it you will need a mirror, a functioning tail/brake light, a light for the license plate, street legal tires, a funtioning head light that is street legal, I think in some cases you need a steel gas tank, not plastic, yours is probably steel.