2012 Subaru imprezza exhaust leak

So I got up this morning and started  my 2012
Subaru Impreza And all the lights came on the
check engine light, traction control,tire pressure,
and the cruise control light was blinking this is
never happened before so I stopped at a little shop
and had them take a look at it they hooked it up to
the computer and it said that I have bad O2
sensors also I think I may have an exhaust leak as
well I don't know how much this is supposed to
cost I don't know where to bring it I don't know
anything at all about these cars any information or
help anyone can give me would be greatly
appreciated