New battery no power no sound

Sounds like alternator is not charging have charging system checked should be charging at 14 volts

I know nothing of cars but I took a leap of faith and ordered alternator and belt. So I really hope so. So jumping it will do no good?

Have the new battery charged first and once vehicle is running can have charging system tested.

I just got a jumpstarts right thing I can charge it with that right? And I was quoted $400 for a friends mobile guy does that sound in the range to fix that he says it’s a 4 hour job

If alternator is working it will charge it self as far as labor for installing google how much to install alternator for your year , make and model and engine size will give you a good idea on labor cost.