Don't try to be clever. Just invest your money in a few different indexes and let it be.
Last year my account grew ~30%, it's increased 16.1% so far this year (the market isn't as crazy as it was in 2013 but it's not bad, either). You need to be disciplined enough to let your money sit and resist the temptation to do dumb things when the market dips.
It's not rocket science, the best way to fuck it all up is to try and manage your money yourself and play the market. Don't do that. There are thousands of bankers out there working 12-14 hours each day to take advantage of people who don't know what they are doing. Don't be a sucker.