Moving to Argentina from south Africa

I sympathize with your position.  But you need a plan that goes forward in small steps, not a big leap all at once.

You say you do not want to live in a city.  Would you put that desire foremost, over and against your fears of coming home to dead family members?  Many people don't like cities but life is easier in most, especially if you do not speak Spanish.  There is more likely to be a community of expats in a city from which you can get support and knowledge daily.  You can always visit the country and farms.  And perhaps eventually move to the country but only once you know what you are doing and know the area well.

In addition to this forum, here are two groups focused on expats in Argentina that may be of some help to you:

https://www.facebook.com/groups/403411839838831/https://www.facebook.com/groups/BuenosAiresExpatHub/

You could also do a search for

moving to argentina requirements

...which will give you a number of links that may prove helpful, as to what you need to do, as well as other aspects of living there.

I strongly advise learning Spanish, beginning now.  Being able to speak and understand even a little Spanish is infinitely preferable to not knowing any.  There are many internet resources, just do a search for

learn spanish

...and you will get many hits including short videos that can help you in every area of the language.