It's always a bit intense for the first couple days but generally once they know where food and water are, I put the drinker on a bit of wood that they can hop up onto to stop shavings getting in so much and hang the feeder at an appropriate height, raising it as they grow. As for bedding, I just keep adding shavings. Bad smell is an indicator that you don't have enough carbon to absorb the moisture in their outputs. You can either clean it out or just add more. I built nice deep brooders out of pallet boxes so just keep whacking it in to keep it all dry and it also means they get to start digging about a bit.
I've seen lots of vids from the US where they deep bed the brooders and rarely clean them out, just keep adding carbon such as straw, chip, shavings or leaves. Results would suggest that this gives the chicks some good immunity from an early age.
As with anything chickeny, damp is the enemy.