Anytime you can start trading no need wait it if you have bitcoin try to trade it in altcoins you dont need a big amount to this you can start if you ready to trade. Small amount in trading is a good one to start in a short trade to increase that small capital.
That's the right way to go on, always start with a small capital and try to learn the tricks of trading and it will also minimize the risks and after spending some time you can go with a higher capital.