Sorry it took me so long to post, but I was hoping someone with more direct experience could answer it. I haven't grown one myself, but my neighbor did, and here's what I saw him do:

He planted the seed in April, about 1 1/2 inches deep in a 6 inch pot, with cactus mix for soil. He kept it by a south-facing wall, in full sun, and watered it every other day. It sprouted in about three weeks, and when it had 4 leaves, he started feeding it every 2 weeks with 1/2 strength fish emulsion. When the heat went over 105 degrees, he moved it to an eastern exposure, and I saw it more rarely.
After two years, it had grown about 4 ft. tall and wide, but then it died in that monster winter of 2006-2007. = ([

Hope that helps,
Kevin : )

Thanks Kevin for taking the time to answer. I decided agains doing this. I was told the tree may not ever beer fruit, which defets the porpuse of planting it.

Thanks again.

Yes, you can plant seeds. You will get a variety of quality of fruit from a seedling, but still the trees are attractive and the fruit may not be commercially the best but still good to eat. Some may grow fast others slow. I have one seedling that was in a pot for one year and just finished it's second year in the ground (total of 3 years old now) and it's only a foot tall.
Mango like partial shade the first 2 or 3 years until they get big enough to shade themselves a little, especially in the summer. You can use anything. One time I planted a standard tree stake in the ground next to the seedling tree, then tied an old umbrella to the stake so that it was shaded in the afternoon. Worked just fine.
Also gophers love mango root like no other. It's like cheese cake with a dab of raspberry on top. Use a chicken wire cage buried in the ground when you make your planting hole to protect it.