Hello! Welcome to justanswer!
It has to be "pressure blead out" with a special tool and a scan tool to get the air out of the ABS unit. Have a shop or Dealer do it. Only 1 hour charge. Otherwise you will put about 50 bucks in brake fluid through it and have no good results.
No, not at all but if the lines are hooked up, the pedal will be firm.
If the lines are wrong, the aBS wont work right.