But look, what about food and jobs and etc..
What about them?
Food will be locally produced for domestic consumption, with some exotic products undoubtably being imported. This food will then be evenly distributed based on specific dietary needs and wants.
And insofar as jobs, in a communist society, work will be undertaken by those with an interest in the field in question or those who chose to contribute time to it. You see, it really depends on what kind of "job" we're talking about here.
For example, many people who are involved in, say, computer programming may also choose to spend some time by the computer factory to help contribute to construction as well as to tweak the designs.
Likewise, someone with an interest in cars would go down to the car factory to realize his ideas on the subject.
Under capitalism, people are forced to reduce their interests to hobbies. They're required to keep their secondary interests to minor size as they cannot afford to do anything else. In communism, however, there is no capitalist class and there is no ownership of production so anyone with an interest in the subject can go and get involved.
This entire process is additionaly self-regulating as if there are too many people in a specific field of work, it will be immediately apparent. There would be lines at the factory and waiting lists at the door. And since humans are naturally impatient creatures, a good number of people will decide that it's not worth the wait and will go and work on something else.
Similarly if there are too few people working, then scarcity will develop and people -- especially people who want whatever is now scarce, will go and help make more of it. Also, those who are already working in whatever field will convince people they know to help them out.
It's the natural self-regulation of society. People don't like to be overcrowded and they don't like to be isolated or wantiong. And so when the technology and social progress are right, society doesn't need "masters" or "markets" to run itself.
you need wealth to back it up in order to make a nice place to work
"Wealth" is a capitalist term, it has no relevence in post-revolutionary society.
All that will be required to make workplaces "nice" will be productive labour something that will have absolutely no connection to "wealth" in a communist environment.
There will be no "hiring" or "firing" of "employees" under communism. It is, after all, the abolition of wage-slavery that we are fighting for!
gold needs to back it all up.

I'm sorry? What does "gold" have to do with communist production?
Not even modern capitalism relies on a "gold standard" anymore, so why you would assume that a post-revolutionary society would is beyond me.
"Gold" is a yellow rock, nothing more; and in a non-capital economy, it will have no special importance.
Gold is occasionaly useful for certain industrial purposes, but beyond this it will have no significant use and certainly will not hold an especially important "role" in economic calculations.
Cuba, although it is a dictatorship runs its economy in a fshion simialer to the way marx would. How come it is a such a poor country??
Cuba is a poor country because it is a poor country.
Like the rest of Latin America, it is the victim of imperialism and colonialism and has been unable to sufficiently develop its technological infastructure so as to raise production above a third-world level.
Considering where it's coming from, however, it's done remarkably well.
And, in terms of whether or not Castro "runs [Cuba's] economy in a fashion similar to the way Marx would", Marx would not have attempted communism (or "socialism") in an isolated third world country and so the question is entirely fansical.
I'd love to change the world, but I don't know what to do, so I leave it up to you...