From the beginning...
Start small
General physical education: base movements, running, jumping, ball throwing... And basic hits.
Go step by step
Increase your agility and endurance, start hitting the ball confidently
Go play!
You can rally now? This is the start of The Game. Go play as often as you like it.
Play more!
Always remember: it's the way, and it is the game! Enjoy it and it will encourage you. Play more!
Try to compete
Feel yourself ready? Go and win tournaments!
Become the champion! Sky is the limit!
It is never late and never early. You could become ATP Pro , or a champion of your club, or just become better than "yesterday yourself". The road will be mastered by the walking.