Abolishing money is a very gradual process, not an immediate one. In lower stages, Labor Vouchers would be paid, and these represent an hour of labor. The difference is that labor Vouchers are destroyed upon first use.
Secondly, difficult, unpleasant, or otherwise undesirable labor would either be paid at a higher ratio, or require less labor per week to make the same amount of labor Vouchers. Alternatively, these dirty jobs may require rotation, so nobody is stuck working them. There are many ways of handling this, with more proposals than you would expect.
So labor vouchers are money that give special treatment to people who do undesirable tasks? Or are they forced upon people at random, like a temporary forced labor lottery?
Neither. It's a replacement for money, based on hours worked. The difference between money and LVs are that LVs are destroyed upon first use, ie you create 4 hours of Value, then trade that for 4 different hours of Value.
People don't get everything for free until productivity is so high that it's practical, which comes from development. The distribution is handled by the Socialist State, typically, until it becomes vestigial and no longer necessary.
Nope, just like it doesn't require unlimited resources and automation to get you to do your chores. However, at a societal scale, its definitely a futuristic goal, which is why Communism is only achievable after Socialism, which is similar to modern society except industry is collectively, rather than individually owned.
Even at a global scale? How would communism produce enough resources to sustain the human race while doing so ethically when at the same time removing all incentives by providing free food, shelter, clothing, entertainment, and everything else for free?
It can only happen at a global scale. There are numerous answers to your question, but again, it isn't as simple as removing all incentives. Read theory, Marx never pretends to know what Communism must look like, which is why Communists focus on achieving Socialism first, as we can very well transition to that now.