Keep it simple.  Run a basic 3-2 motion offense where you focus on the skill of screening away and freeing up a man for a layup or open jump shot.  If they learn the fundamentals of running through their progressions of screening low and looking for the open man you won't have to worry about running through too many set plays which they will ultimately forget.

I agree with the 3-2 Motion, basket cut, rotate and fill in ...it's simple enough for young minds to graps.

Check out www.betterbasketball.com also...there's a video there on their "Read and React" offense and it's about 8 minutes worth of footage that is great.  I took it into practice with my girls travel team (now 5th grade) and they picked it up quick!  We finally look like we know how to keep spacing after 2 years!  LOL!

It really depends on the skill set of your team.   A free lance passing game is always easiest.  Just pass and cut to the basket then look for the open shot.  Try to space the floor in some manner.

LG

Walnut Creek, CA

WCYAA Rec League

If they are double teaming your guards...the wings have to come ball screen (obviously) and your guards can't kill the dribble (the problem I'm working on).  Finish everything by rolling to the basket...passes, screens...

One thing that may help is taking the basketball out of the drill in practice.  Get them to understand the basic set up of the 3-2 or try 4 out also, ...(like they show in the video).  Make them set up, PG with the "imaginary ball"...he makes his pass to wich ever wing, and cuts.  Then teach the kids to motion .  If you have 10 kids, pair them up and have them walk through the drills so you are teaching the whole team.  And really in the 4-1, you don't even have to worry about the 1 because he will merely be shadowing the ball where it get's passed to in hopes to dump into the post at some point.

First read for wing is the cutter, second is the filler, thrid is the dribble.