If you're not good with PowerPoint, maybe try Google Slides. It's a little easier to work with if you're okay with its limitations. I think the whole silent classroom is up to each individual teacher's preference. Personally, I don't mind my students talking with each other while they work as long as they CAN work while talking. I give them a three strikes and you're out deal. If they can finish their bell ringer while talking quietly, then I'm fine with it. I do have them sitting in groups though, so I know it is going to happen. However, I do expect that while I'm talking or someone else is addressing the class that they are respectful and keep silent. During assessments, I tell them upfront that I expect their behavior to be the same as it would be when taking a state test: no talking, stay in your seat, face forward, etc. I feel like kids need time to talk. If you think about it, most adults don't sit and do their work without talking to someone else about something, but we also know when it is time to stop talking and listen. Collaboration is good, and you will always know the students who can't talk while they work because they never get anything finished. I usually tell them that if I can hear their conversations enough that I know exactly who is talking and about what, they are too loud. Maybe you could give your kids more time to collaborate or talk out what they're doing with a partner. I've been known to tell mine that if I can get through all I need to do that day because they are well behaved, then they can have the last 5 minutes of class to talk quietly. They have to stay in their seat and be quiet, but they respect my time because they know they will get that 5 minutes. I don't do this often, but I feel like every once awhile is okay.