If you're currently earning your masters, I would encourage you to utilize the resources in your masters program to start developing professional relationships now. In a relational field like social work, networking and getting to know other professionals still matters quite a bit. While you're earning your masters you'll likely be given the opportunity/or be required to participate in practice internships. Use those opportunities to both figure out what avenue of social work you want to pursue and also to develop relationships that will help you find a job when you graduate.
Another great resource is professional organizations. Joining a professional organization such as the National Association of Social Workers (NASW) or something similar is a great way to get connected. Membership fees are often lowered or waived for students, so take advantage of that and get the most that you can out of your education.