Try and make them interesting ,progressive and a challenge to all participants . Whichever skill you do ,start with the basics then move on to a repetition .If the group struggle ,re do ,or if you get a mixed response ,put a difficulty factor in . ie post drills you move back when successful,switch hands.With a slide drill ,put a time limit ,or stride limit to make them pick speed up.If you have a "back centred shaped player" who is never going to superman into snake use him as a lane to make the dive off the break harder and more realistic ,while keeping the other player involved with the drill.As any skills practice progresses ,coaching points will pop up (hopefully) to you .Dont be afraid to just,Stop ,30 sec coaching point ,preferably with a quick demo. This does not have to be you ,sometimes you will find one of your team has it nailed and use them .Leaves you free to coach while group watch. Either a breakout drill or gunfight drill will move you forwards ,looking to try and get the skillls you have been practicing highlighted. Finally points .When you finish it's worth getting group together for 5/10 mins to give you feedback and how they felt it went .Too many paintball teams just drift off after training ,after getting their fix without evaluating what they got out the session good or bad .Use this template and fit it to your group ,bearing in mind the 2 objects of your session are to advance the skills of your team while they are still enjoying it .Once you find the session that suits you ,you can move to different practice topics done in the same way.Both you will be familiar ,therefore more focused and the group will understand the process and get more out of it .Hope this helps