I'm aware that some plants thrive in different weather/climates but never ever heard of altitudes being any kind of factors. Tropical climate usually has longer sun so you could do indicas or sativas, whichever you prefer i suppose. And as far as what you want help with, type of high, flavours, taste mesical conditions and whatever else will help you get suggestions on strains. I'd absolutely support you checking out Mephisto first. Dinafem, Sweet Seeds, Dutch Passion, Fast Buds are all top choices for good autos as a start.