I want to start doing tennis, advice?

So, I am a sophomore in high school and I want to join my tennis team in the in the spring. I have never played a sport due to being uncoordinated and fear of ridicule of my classmates.I do not want that to stop me. I don't want not having money for lessons to stop me..

My mom said she would help me learn..but that was three months ago at the beginning of summer.

SO I am taking things into my own hands.I want to teach tennis to myself, I want to work my butt off to do this. I always thought tennis was cool since I was little..Any advice..good websites..exercises?:)
I want to start doing tennis, advice?
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