Sapote, for germinating the mango seeds, I use two methods depending on how fast I need them to sprout. If I need a seedling ASAP, I remove the embryo from the husk and wrap them up in a moist paper towel and put this into a plastic ziplock bag. I then put this bag of seeds on something very warm like a seedling heat mat, something approximately 95 degrees and you'll see roots pop out within two weeks.
If I'm not in a rush for seedlings, I simply plant the de husked mango embryos directly into my garden soil where I know it will get water at least once a week. I completely bury the embryo with about .5-1 inch of soil. If I'm planting mono seeds, I plant the seed vertically with the hump up, difficult to tell where the hump is with some seeds. If I'm planting poly seeds, I plant the embryo on its flat side.
Actually I have a third technique. Lately I've been planting my mango embryos into large plastic half barrels from Home Depot. I did some experiments with different potting soils in the past and discovered that I got the best sprouting of most varieties of seeds using Miracle Grow potting soil. It works better than the more expensive potting soils I've tried. When seeds are planted with these last two methods, when they sprout will depend on average daily temps.
Simon