I started trading all my deposit directly from the coins I received from the bounty campaigns. I dont feel sorry for them, so I can trade on all coins.
It can be a good idea.You can join first some legit bounty campaigns and the profit you will make could be you starting capital for your first trading.It does not make sense to start with a big capital at first knowing it can give you a large profit,for me start with a capital you can afford to lose.
It depends upon person to person on how much can he / she invest to start the trading. I think it is advisable to start with the less amount and increase the trading capital once he gains good profit and experience.