uhm... just deposit your etherium and start gambling,not a rocket science
there are so many trusted ETH gambling sites out ther:one of them in my signature "winks"
Bitsler accepts nine different currencies now,including etherium
another good choice is crypto-games,they accept lots of coins too
the only problem is not all of the sites are crediting funds from smart contracts,so make sure you are sending from the regular wallet when you deposit
other than that,fast deposits,fast confirmations,relatively low tx fees-I like betting with ETH