1- In public programs (can be religious programs like youth groups or retreats), observe and try to see if the guy seems to have a good character. Then investigate by asking people in your community about him. Have someone ask his friends to evaluate him. If all indications are positive try to get to know him and see if there is an opportunity.
2- Go to some community members who know a lot of people and work with people. Tell them you are interested in getting married and ask them if they can recommend someone. Once they recommended someone investigate about the person and see if there is an opportunity.