Hashflare is really easy to use, they do support mining of Bitcoins / Litecoin / Ethereum And Dash... just have to pick which one you want to mine on... and slide for amount you want to put in / buy hash rate.
I didn't see the estimates till the day after I started, but there is other websites you can use to get this in advance
just set power and cost KWH to 0
Yep hashflare is really easy to use so it like passive income :) you invest some $ and forget :D