Your questions are legitimate but get into the realm of speculation. It really depends on the form the socialist society takes. The USSR had a negative feedback loop of constantly lowering quotas as factories performed worse and worse. I think a magazine article I read talked about how restaurants in the USSR were bad on purpose so they received less business. It makes sense in a way, if the factory just fails to meet a quota, you don't want to push even more work on them. They'll just be in a constant state of never reaching the quota.

In a way, the questions you're raising are akin to a serf working the land of their lord and wondering how a system like capitalism would ever work. The reality is that we don't know. We can only examine the material conditions as they exist currently and advocate for better ones.

One solution is to break society down into smaller, self-sufficient communities as we can reasonably achieve. Shoe factory workers would be less inclined to shoddy workmanship if everyone they knew wore the terrible shoes they made and they received constant complaints.

I certainly do have some recommendations for reading! Understanding Marxism is incredibly difficult and can only be achieved by actively working towards it - like a college class. I've read numerous works for the better part of two years now and I just now feel like I'm getting my bearings.

Why Socialism? | Albert Einstein (I recommend this as the starting point for anyone interested in learning about socialism more broadly)

The Principles of Communism | Frederick Engles

Value, Price and Profit | Karl Marx

Wage-labour and Capital | Karl Marx

If you want something more advanced, you can also read the first chapter of Capital (Marx) volume 1. I'm in the middle of reading Capital myself at the moment and I have to admit it is extremely dry.