better to learn trading or poker with bitcoin, there is some skill involved at least, and they aren't 100% luck contrary to the general belief
with poker there should be some freeroll where you can earn some free btc(don't expect too much but still b etter than nothing) and then playing with those coins
or if you still want to try gambling, binary options can be profitable. there's a large house edge on payouts to compensate for this, but if yu know what youre doing profiting is definitely possible in the long run.