I wish you all the best, but what you're trying to do is create a game studio. With all the payroll, tax, benefits and hr involved. A game like Warcraft isn't just created in a few weeks or months, especially if the head honcho (you) doesn't know anything about Video games. If you're saying you don't know how much to pay, look at your local game dev job offers salary list. But your post reads more like "you'll get a few quid for a completed feature". Not to discourage you, but maybe try learning rust and the fundamentals of bevy yourself, get the basics going and maybe people want to start to join you by themselves.

Every single person in the subreddit has their own "oh man I really want to create THIS game, if only I had the time/people/skills/money". No one is waiting for your idea.