Go small at first and build to something bigger. I'm still at the small phase, but I've earned a few hundred dollars in 2 months and still just getting ROI in. Do some math and work out the details of what you want to do in excel it's very helpful. I also invest in multiple coins, bitcoin, litecoin, and now feathercoin. I'm probably going to jump into others as I get my profits coming in from mining etc. Some coins will loose and some will win, you just have to pick reasonable amounts of all of them so that you come out ahead almost no matter what happens.