Create a timeline. Planning can make or break your application cycle. Allow ample time to obtain letters of recommendation. Try to obtain at least one from a professor who taught you during your master's degree program.
Take the LSAT. Every accredited law school in the United States requires the LSAT. Master's degree holders take the same LSAT as other applicants.
Apply for the programs you are interested in attending. Be sure to note your master's degree in your application packet. Most schools have specialized programs for master's degree holders. For example, Stanford offers The Master of Legal Studies (MLS) degree. Stanford selects very few students for this program annually. Check with the schools you are applying to in order to learn of their master's legal programs. Some may even require additional essays.