Choose a final aesthetic for your magazine. How your magazine looks will define its brand almost as much as the content itself. Consider:
The font: Are you using fonts inside the magazine that are easy to read and fit with your theme? Do they call back to the font you used for your magazine's title, on the cover?
The paper: Are you going to print your magazine on glossy or matte paper?
The color: Some magazines, such as People, used to be half color, half black and white to save on ink costs. Many literary magazines are printed in black and white, though most mainstream titles have moved to color. Consider what you can afford to spend on ink per issue, and how you can incorporate that into your magazine's look and feel.