Dear all, anyone know how to plant mangosteen?

hi guys, i'm a student, and i'm sitting on a 5 acres of land in lanchang, pahang that my mum had no use for. she gave me permission to do away with it, and i thought why not farming / fishing right?

thing is, i have no idea where to start. i was thinking on going to local seminar and workshop by the agriculture ministry just so that i can get a gist of what i can and should do with the land in the future. but any more input / ideas / direction would be much appreciated. thanks

hi all, does anyone know any shop that sells ladybug Delphastus for whiteflies control?
the housing area i'm at have too much and it become impossible to keep spraying neem oil every day (bcoz there are some shared space so i can only spray on my plants)

another thought is to smoke it out though... any sifu can help? thanks thanks