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 over watering. Plus if a beginner runs into problems with PH or over fertilization the properties of this soil make it quick and easy to remedy.