To get started, you will want to join YMCA using membership that best suites your needs and goals.
The first two classes are FREE!
You will also want to join the USJA. Most clubs, clinics, seminars and tournaments will not let you practice judo unless you are a member. USJA membership protects everyone's interests and helps you to receive a full credit for your training towards your Judo rank promotions.
You may also want to purchase a Judo uniform (Judo Gi) as soon as you start training. They are inexpensive and will last a long time.