5 years is very short term, and since you are sure you'll need the money, investing it into the markets should probably not be done. You can toss it in Ally bank for 1% or consider a 5 yr raise your rate CD
A decent write-up on time horizons: http://www.investopedia.com/articles/investing/110813/using-time-horizons-investing.asp
If you want to go the stock/bond route you can assess the benefits of using something like a vanguard target date fund, or a roboadvisor such as wealthfront or betterment.
You need to assess whether you think you may move up your time horizon, say you want to buy a house in 4 years, or, if it is 5 years, are you ok with it being 6.5-7 if there is a market downturn.