Agree with Eamonnshute re throw ins. One drill my kids liked was divide into 4-5 lines with keeper in goal. Line 1 on side throw in, line 2 recieve throw down line and carry down side to cross, line 3 defend against 2 but only to challenge not steal or tackle (allow 2 to get cross out), lines 4 & 5 go toward goal for cross from 2.
1/..2..3.........................................4..............5
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Rotation: 1 goes to back of line 2 after throw, 2 to 3, 3 to 4, 4 to 5, and 5 to 1.