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

https://www.cryptocompare.com/mining/calculator/btc?HashingPower=10.32&HashingUnit=TH%2Fs&PowerConsumption=0&CostPerkWh=0&MiningPoolFee=2

just set power and cost KWH to 0