The very best gift you can give these kids at this level, is the love of the game; it has to be fun. I like to break up skill work with various playground or rec. games such as tag. The volleytrainers are a great tool as well as the cheap blow up beach balls, for hitting especially. I suggest lowering the net to the lowest spot and moving the endline up about 4-5 feet. This takes a lot of the fear of pain out and some frustration too. Implement games that require them to MOVE and TALK and the skills will come later, the upper level coaches will thank you later. Breaking skills down to the basic is key. For example, get them in position to forearm pass and have a partner toss and the passer actually catching the ball in the correct position and toss back. Setting and hitting can be done like this too.