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I would just sow them in a good moist soil and wait 20 to 90 days for them to sprout (64ºF to 86ºF, 18ºC to 30ºC), in the shade; no summer sun when small, good water if possible (rain, acid), or without chlorine; use acid soil with sphagnum moss or river peat with nice forest leaves or so, garden soil, something that drains well like perlite or vermiculite, some organic matter ... I would later add manure, not when I sow.
For jaboticabas, eugenias, campomanesias, psidium, etc. (rainforest species):
Be very careful with the direct sun in summer or when it is very hot, get accustomed to the shade and never lack water. They could take full sun when taller than 2 feet or 60cm or so, before that, use morning sun or half shade (not too hot from the afternoon heat). Psidium and Campomanesias would support more sun, but take care: if they dont like your soil and/or dont have enought watering, they will suffer with hot sun.
Chañar is from dry to humid climate (It grows in grassland where it has no trees above it and can live isolated.), it can live with 700mm to 1500mm of anual rain. I dont have much experience sprouting them but I remember they can take 1 month or more. They can take more sun than the others. Some people say “most of fabaceae family plant seeds need soaking in warm water for 12-24 hours. The germinating time will be shorter with this method.”
Good luck!
Cheers