Basically its purely depends on you that with how much money you can start, But I started with 1 bitcoin & bought diff Alt alt coins as well & did trading & continue to increase my Bitcoin & in the present scenario I would suggest you to invest in bitcoin rather than stocks because as per my analysis I am seeing bitcoin more bullish, so if we hold bitcoin it will definately gives you good return & apart from this always invest that much amount that can you afford to loose in online industry, never put you hard earned money & before investing in bitcoin study yourself also on youtube there are numerous videos available on Youtube or you can study this forum to increase your knowledge regarding bitcoin it will certainly help you to took wise decision.