I don't believe in interest checks.
Well, let's qualify that statement. I don't believe in interest checks that rely heavily on letting the general public make decisions that you should be able to do. Figuring out the marketability of a zine is one thing, but pricing and cost control strategies should be up to the mods. You should know how much you can afford to spend for a zine if it doesn't break even.
From the beginning, and unless it is a free digital zine, you need to think about money. Run a zine with the understanding you are commissioning 20-60 creators for their time and skills, because quite frankly a free PDF for work that shows up in a physical product is disrespectful of a creative's work. Have the means to at least provide them with free physical bundles, even if it is a charity zine. (They can opt out of it, sure, but you should be able to give them the option.)
Budget:
The Zine:
Contributors:
Merch Specs:
Mod Responsibilities:
Accounts:
Figure out what your zine name is early, because it affects everything that follows here. Make sure you and your mod team have a way of accessing all these accounts too, and that you know where to keep all the passwords.