5 Conditions for becoming good communicator

1. Burning Desire to communicate..learn the language you want to communicate in. Improve your voice intonation. Make your thoughts clear.
2. Understand the process of communication. Communicating is basically sending and receiving images, though we speak or write in words. Just communicate in a way, that you can make other people understand your thoughts.
3. Master certain basic skills like connecting with audience, conveyed messages they understand and get their response back. 
4. Practicing what you want to communicate. Just practice to become superb, and don't get satisfy. Never have complacent attitude.
5. Have patience, growth takes time. 

Also notice how you are going. Use self criticism to improve yourself. Accept that you are going wrong, when you are going wrong.