There are two options: You can build your own tree, first identifying your ancestors, then their siblings and the siblings' descendants until you find the specific people who match you. Or you can contact your matches and hope that they have already done the research and can tell you how you are related to them.
Or if neither you nor the matches have done the research, maybe they would be interested in working with you. If each person builds their own tree, somewhere those trees should converge.
If you have a tree you can link to your DNA results, that will help your matches research the connections.
And make sure your matches can contact you if they are interested. Respond to messages when people contact you.
Good luck!