re: First time soccer coach, please help (4-6 year olds)

At that age you'd be wasting your time trying to teach tactics or principles. The most important thing at that age is to get them comfortable touching the ball and teach them general rules (for example, the ball is out of bounds when it rolls in the parking lot, no need for the whole team to chase it and keep kicking it at that point)

You can do that by playing games designed for them to dribble, stop, protect the ball and change directions.

Sharks and Minnows- Establish a large circle. All but two kids have a ball (minnows), the other two (sharks) try to kick the kids balls out of the circle while they try to avoid the sharks and protect their balls. Last two remaining are sharks next round.

Red Light/Green Light- RL/GL while dribbling a soccer ball.

Hula Hoop- Throw hula hoops out on the pitch (one hoop less than the number of players you have). When you say "go" each player dribbles to a hoop (base), only one per hoop. The kid left out is out of the game. Pick up a hoop and do it again, last one standing wins.

You can find a lot of these games online that will keep the kids attention. At this age keeping their attention is a huge task and as others have said, make sure they are all involved with a ball... That will make your life easier.

Also some easy, beneficial skills to teach at this age are stopping the ball, pulling the ball back and touching the ball laterally with the outside of the foot.