I wouldn't bother with growing citrus trees from seed. The tree will take
YEARS to reach producing size. More importantly, citrus trees are usually
grafted onto "Sour Orange" rootstock. Sour Orange is not suseptable to
nematodes and makes for a better and healtier fruit tree.

I would recomend that you seek out a professional nursery and obtain a variety
that you will enjoy. Sometimes you can find "multigrafts" that have more than
one variety of citrus on a single stock.

Good luck!