Plant high, with the graft union well above soil level, to prevent the roots from being too wet and to avoid foot rot disease. Citrus requires minimum pruning. Remove suckers and dead or diseased wood as they appear, but while you may want to occasionally shape your tree, heavier pruning may slow fruit production if you remove too much foliage. As your tree matures, it will yield heavier crops. Flower and fruit drop is common, and there's nothing you can do about it.
Less fruit can mean larger fruit.
Satsumas attract swallowtail butterflies. I have crab grass that is taking over my front beds. I have tried two herbicides. I have dug the weeds out, down to the roots. These are 6 to 10 inches beneath the surface.