You are probably required to take distributions from an inherited IRA - you should do some research online - schwab's website and irs.gov both have information about it. There may also be books at the library if you prefer that method.
If you must take distributions, you might want a bond allocation to better handle market drops. When stocks drop, and you're forced to withdraw money, the impact is greater than if you had a portion allocated to bonds (which tend to drop less during stock corrections).
You can take a look at Schwab target date funds for sample allocations.