For noe i dont raise big funds to start trading until the altcoins in the market now decreasing their price daily but we should wait until the price will back to normal and have a good situation trading.
Well you can invest any amount in any coins that you want to trade in. This also depends on your budget and if you can afford to invest big, you can trade big as well. In addition, trading make you more able to make money only if you are a real trader.