u/ComprehensiveAd2429

Hello everybody I'm a newish dm this is like my 1st big campaign and module I've ever ran. I have ran some homebrew sessions and one one shot. But I'm getting ready to start this campaign with 8 players (who all played the one shot) and am looking for ways to make the combat more interesting and not just have it turn into a slog waiting for people to take there turns. Also curious to what plots other people have used for there dungeons to give me some ideas. I appreciate any assistance.