Depends on your positioning, which type you want to do. Now catering may be more popular graphic combination, such as KFC, Yoshinoya, millet girl and so on.
First of all, look at which type you do, such as doing restaurants, Lu Cai Xiang Cai, or do fast food, or rice noodles, buffet, western food according to different types to choose a different style.
After determining the style, then according to the characteristics of the product to conceptualize. The appearance of the product, culture, style, etc. are all considerations for logo design.
A spicy hot you if you design a high-end atmospheric class logo, the effect may not be so good; a Western restaurant design a lovely countryside non-mainstream estimates will also make people difficult.
Logo, letters, hanzi, graphics, images, basically these four elements. The other according to the actual need to choose, product, culture, style, positioning these, basically can do it.