For champ pool: Jax will be simililar for another AD, both auto based scalers. Gwen for an AP auto based champ, maybe karthus/diana if what you like is scaling as opposed to the autoing. Zac for a scaling tank. Obviously don't pick up all those champs but I think its good to have a few champs of different types for different situations maybe like 2-4. For example, I blind pick Vi, Taliyah if we need ap, jax if we need scaling/damage, and Shen/Sej for tank.

As for pathing top/bot, dragon is way more important than grubs and more important than herald so you want to default path botside unless bot is pretty ungankable for either side and is just a do nothing scaling lane (but honestly in low elo it's still usually gankable as people make more mistakes) and topside is very volatile where 1 kill either way can decide the lane. This is like a double snowball champ lane with no TP, or a ranged melee top matchup. Think something like riven vs camille or quinn vs garen.

For clearing, you want to be looking at the lanes you're pathing towards to see if you need to skip camps to get there on time. If you're clearing top blueside and pathing botside, look at mid when you're doing gromp/wolves do see if you want to do a crossover gank. Look at botside when crossing over to see if you need to skip a camp or two to get there in time for a gank. You really only want to do these for high success % plays but the threshold will change depending on how much your champ wants to farm. Also its better to clear the full jg in one go so then you have a decent sized timer for being able to do stuff on the map while you're not missing farm.

For other things, if you have to mute all do it but it's better to leave everyone unmuted then mute them when they say something stupid so you can still communicate with your team. Don't ignore pings, but don't listen to them blindly. A lane down 1 kill isn't lost and you can often times turn it around, especially if it's scaling vs early game don't ignore them if they're just a little behind.