There are many ways to promote your church (or church plant) to the surrounding community.
You can have big outreach events geared around a holiday, such as a Christmas or Easter pageant. You can have programs geared towards the neighborhood, such as after school programs or Vacation Bible School. You can sponsor social events, like a carnival or the classic fish fry. You can go door to door, handing out flyers, leaflets, etc.
Of course, there’s nothing wrong with hoping to find a spouse at church (so long as that’s not your primary reason for attending). Indeed, the church is, in many ways, the ideal place for Christians to find a spouse. That was something I held to when I was single, and I know that’s the case for many others.
But there is something wrong with converting the church to a meat market/dating service, with using the prospect of a “hot” wife (or husband) — that is, if you assume “hot” to be a good basis for a marriage to begin with — as one of your church’s “selling” points.