There are several reputable DNA labs, Ancestry is the largest. We are using such tests to locate family, particularly fathers where little or no information is known. It’s impossible to predict the likelihood of success as it depends on who in your family has tested. You may find a close match or only matches linked many generations ago. If you receive your results and want some help with outreach you are welcome to contact us .We can also refer you to a DNA genealogical specialist who is in private practice but charges very reasonable fees.