hau Ronaldo, if you would, please include your location information so we know what part of the world we are talking about. We can give better answers that way.
Neem trees (here in the USA) will only grow in USDA Zone 9 and 10, which means the lower Texas (Brownsville) to Florida ( Tampa and lower). These trees need warm weather all year round or at least fairly warm weather, so If you located in Mexico or all the other Countries that make up South America, or someplace like Africa or India, then you are set. Just plant and water occasionally once they are established. Neem likes most soils, Clay to Loam but clay seems to be the normal soil they are found in in nature. any of the nitrogen fixers or brassicas will partner well with Neem.