You received great advice above there! ^
I think you definitely need to work with the trouble makers of the bunch first and foremost. Because they're the ones started all the ruckus it sounds like. If you can't walk all 6 at once (understandable!) then you really need to dedicate a walk (at least 15 mins) for each of them, or maybe two at a time. Walking is way different than just running around in the backyard. Too many owners think dogs don't need a walk because they have a fenced in yard but that's not true. The walk is part of what makes them a pack, and if they are following you like they are supposed to be, it drains a lot of energy out of them! Walks are really great! Definitely sounds like you need to become in charge!
Do NOT let them rule you!! Start with simple things... make them sit before receiving their food, YOU walk out the door before them, you walk in front of them on walks, etc. Let them know who is boss. I definitely think you should have thought about owning six dogs a little more! It's hard enough with 1 or 2! But if you got 6 little dogs trying to dominant you... it makes it more difficult.