Nicolas, here’s my advice, don't be a zealot, set priorities, be patient and compromise. for instance, if you want create a communist country, don’t start a full scale land reform, break all relationships with US, kick out the right-wing of military, nationalise the marketing board and set in food prices all at once. Or at all.
If you intend to follow a left wing course, don’t fill in your govt exclusively with leftists, elect one or if possible more christen democrats at posts you think they’ll hurt your goals the least. A conservative would help fend off threats from that corner, but his opinions would be a pain in the **** and compromising on policies would be more effective to neutralise right-wing threats IMHO.
You should immediately tackle the food price problem, since support of the masses is important. The difficulty is that each solution brings up another problem, IIRC the best solution was to end with food stamps and subsidies to farmers. Pretty draconian and expensive but it improves nutrition and food production.
Don’t alienate the right-wing side of the military or US just yet, immediately putting on trial the deaths-squads isn’t very wise either. But over time, as you strengthen your position you should be able to kick them out.
Be gentle in your land reform, try to hurt the big landowners as little as possible. Selling state-owned estates is a good way to satisfy the campesinos without hitting the cotton producers.
It’s likely you won’t reach many of your goals, but that’s how politics, and indeed life, is.