I'm a beginner and need a simple and easy soilless mix

From your local Hydro store get some Promix, vermiculite, and Perlite.
Mix in the portions of 50% promix, 35% perlite, and 15% vermiculite. This mix is nice and loose and will promote great and fast root growth. All though it doesn't retain water that well it is good for beginners because it will help safeguard against overwatering. Plus if a beginner runs into problems with PH or over fertilization the properties of this soil make it quick and easy to remedy.