Am i right to assume that you don't know what altcoin futures are yet? Because that question is too vague to have an answer.
You are not telling us if you know technical analysis to base your decision of shorting or longing it, nor you are saying how much leverage are you confortable to use. And if you don't know anything about risks in those, how is any of this a good idea? Playing with futures can make you money, for sure, but get even experienced traders get rekt if they aren't careful with it.

If you already know everything there's to know, then sorry if i sound condescending. If not, there is ton of reading material everywhere in net.