PRACTICE PRACTICE PRACTICE!! *died*

Press C on your keyboard and viola you're balanced

try to keep an open stance. feet far from each other try counter balancing using arms n such

Just hang out with pro players.

HORSE STANCE

Its the best way to get balance (especially in Sparring) and of course PRACTICE

There is no way to immediately master balance, so practice, but a tip I use is when you fall foreword, extend your ankles for a few frames and when you fall back, contract them.