The rule of thumb is that for the first week they should be kept at 95 degrees f, decreasing by 5 degrees a week until you get them down to room temperature. So yes, you'll need some form of supplemental heat (unless they're four weeks old / fully feathered when you get them).
Here's what I feed (which they stock at the local Tractor Supply): https://www.purinamills.com/game-bird-feed/products/detail/purina-game-bird-turkey-startena