You are a little bit afraid, are you? Don´t ask, simply do! I started dancing late in my life but with skin and hair. You do not need any money. You do not need any teacher or classes. But you need long wind, passion and volition. You need to be open, you should ask for feed back, should mind that dancing includes musical as well as social skills. Then you will get it and be set for the rest of your life. Have you tried http://www.meetup.com/Argentine-Tango-Riverside ?