You have a +2 bonus to attack and damage rolls made with this magic weapon.
Proficiency with a longbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.
Notes: Bonus: Magic, Damage, Combat, Ammunition, Heavy, Range, Two-Handed
Do normal arrows fired from a magical crossbow count as magical attacks against a creature immune to non-magical attacks?
Yes it would.