Three quick questions! (new game + and Weapon upgrade)

Hey! I've got two quick questions that I hope someone can answer~

1: I've been using a Divine weapon and planed on just kinda sticking with that, but I've been wondering, the magic part of the damage applies on everything right? Divine just gives more damage on undead stuff but will still always do the physical/Magic damage, right?

2: can Someone who New game +'s play with someone who hasn't New game +'d? I'm keeping my level low (26) because I want to help new players, but I'm wondering if beating the game will mean I can't be summoned by the new players :x..

1: Yes
2: Yes, you can play with people regardless of what playthrough they're on.

Thanks. I don't know what's with my wording on this forum. I spelled my own name wrong and I said three questions instead of two!

But thanks a ton for your info!