This should be a great thread. I've coached 8U for several years. However, I coach Rec ball so its a different group of kids every year with generally more than half beginners (we re-draft every season).
For hitting, especially early in the season, I like to do several stations so that kids can get as many swings as possible. At least 3 stations (tee, soft toss (wiffle or wiffle golf balls) and coach pitch). Just make sure that all of the coaches are on the same page of what you are going to teach them and have your best hitting coach on the tee trying to get fundamentals down.
The hard part of this for me is that you have to have at least 4 adults to do it. The other kids can work on fielding or just play catch. Like you overhand throwing is my pet peeve in our Rec league, we never seem to do as good a job teaching it as we need to. I've accepted that with limited time there's is only so much we can do if the parents won't go home and play catch with their kids.
Biggest thing at this age is to limit the amount of time they are standing around or in line and keep things moving.