In general, what measures would be in place to ensure that the party's interests are always the people's interests? I mean, it feels like this would be open to exploitation if the party had the power to choose which freedoms the people had.

Absolutely, that's one of the main criticisms of Leninism and his concept of the vanguard party. How do we prevent opportunism, corruption and a regression back to capitalism? But the same question can be asked about a more libertarian approach. Reformism has been shown not to work very well either because they always tend to settle with capitalism and abandon the quest for socialism. I don't have a good answer to this, and it's something I think about a lot. I think going with a libertarian approach is probably better ultimately, but that would require an extreme level of class consciousness overall.

One thing I'd like to highlight, though, is that just because the people votes for something doesn't necessarily means it represents the will of the people. Taking a look at the American political climate, for example, the rich upper class has spent billions on propaganda to mislead the working class. The working class wants stability and safety, and they've been lead to believe that voting for e.g. Trump will bring this. So when they vote for Trump, does this really represent the will of the people? No, of course not. It represents the will of billionaires.

I don't know a lot about socialism and about the world that you'd want to create, but it seems really interesting to me. Do you have any books or papers you'd recommend to start from?

Read Lenin (What is to Be Done?*and The State and Revolution). For criticisms of Leninism, I recommend Rosa Luxemburg (Reform or Revolution and The Russian Revolution).