In a good crop, the male will still be plenty smokable and should not be thrown away under any circumstances. The male plant dies in the 12th week of growing, the female will live another 3 - 5 weeks to produce her younguns. Females can weigh twice as much as males when they are mature. Marijuana soil should compact when you squeeze it, but should also break apart with a small pressure and absorb water well. A nice test for either indoor or outdoor growing is to add a bunch of worms to the soil, if they live and hang aroung, it is good soil, but if they don't, well, change it.
Worms also help keep the soil loose enough for the plants to grow well.
To get good grass, you should start with the right seeds. A nice starting point is to save the seeds form the best batch you have consumed. The seeds should be virile, that is, they should not be grey and shiriveled up, but green, meaty, and healthy appearing. A nice test is to drop the seeds on a hot frying pan. The seeds should be soaked in distilled water overnight before planting.