What should I look for in a choreography for a song and dance?

The key point of partner dancing is not to make the stage look empty, but to let all the dancers fill the whole stage. The formation is mainly in quadrangles, cross-crosses, and from cross-crosses to four dots on the periphery, with a triangle or quadrangle in the center. The movement can be repeated a lot, but the fluidity should be big, so that people feel that the stage is not static.