Italian (beginner)

[SteveBrand79]

Hi,
When would you use the following and which one is correct.
Sono bene
Sono buono
Sto bene
Sto buono

Another one that gets me… correct or not.
il mio Italiano non va bene
il mio Italiano non è buono

If vinire becomes vengo as in “vengo da Sud Africa” (I come from South Africa), why would Google translate give me sono da Sud Africa? What’s the difference and which one is correct. I’m from South Africa OR I come from South Africa…?

Just started learning…

Thanks to anyone and everyone that would be able to assists.
Grazie mila