How many kids get to play at once? U8 at a national level is supposed to now mean 4 players on each side with no goalies, but some local organizations still insist on putting 6 kids on the field with a goalie which leads to clusters on the field.
Rule #1 for recreational soccer IMO, is the score doesn't mean anything. This game is fun, kids at this age hate failure and especially it being pointed out. Install the mentality from practice 1 that it is okay to fail, and that you want them to try new things and to have fun. Nobody is allowed to point out failures on your team, reward effort and trying new things.
Practice schedule that will work
First 5-10 minutes- Warm ups, don't waste time stretching or old style of warm ups, let the kids jog around the field for 1-2 minutes to get the blood flowing, then setup cones and let them dribble the ball back and forth for another few minutes, then separate them into 2 lines and allow them to pass to the other line and then follow their pass to switch spots in line for a few minutes
Next 5 minutes- work on technique, dribbling and passing in soccer are done with the inside and outside of the feet, not your toes. Work with the players on dribbling back and forth between cones, watching for proper technique.
Next 10 minutes- Setup games of sharks and minnows, this is a game designed to teach control and movement to the players, but in a fun way. Build a 20 X 20 field and each player is a minnow who needs to "swim" with their ball and keep the sharks away from their balls. The coach should start as the shark, then once the minnows are gone let one or two of the kids be the shark next, rotate until everyone gets to be a shark. Make sure the kids keep moving and watch where they are going. Encourage players to use the outside and insides of their feet to control the ball, not the toes.
Next 5 minutes- work on shooting/passing- place a ball 10 feet away from the kids on a cone- place the players in a line, have each player pass/shoot at the ball in attempt to knock it off the cone. Work with the players to have them use the insides of their feet to pass/shoot rather than their toes.
Next 5 minutes- use the same drill, but make yourself the target, turn your back to the kids and have them try to hit you with their pass/shot
Next 15 minutes- setup a small field and have the players play a scrimmage- 4 players on each side without a goalie is ideal. Work on keeping the players spaced apart (don't cluster) and reward passing and teamwork, the goal of soccer is to get the ball into open space and to have time on the ball/avoid pressure. A variation of this game can be to make 2 goals on each side of the field, players can score in any goal. This can help teach spacing of players instead of focusing/clustering around a single target.
Final 5 minutes- talk to the kids, thank them for working hard- talk to parents about the next practice or game information
Finally
You can get a US Soccer "F" license, basically it's a 2 hour online course that is intended for those parenting or coaching youth players, for $25, but this is probably overkill for what you are doing.
http://www.usyouthsoccer.org/coaches/Education/