Germination
Cannabis seeds need only water, heat, and air to germinate. They do not need extra hormones to germinate. Seeds sprout without light in a wide range of temperatures. Properly nurtured seeds germinate in two to seven days, in temperatures from 70-90*F (21-32*C). Temperatures above 90*F (32*C) impair germination. At germination, the outside protective shell of the seed splits, and a tiny, white sprout (radicle) pops out. This sprout is the root or taproot. Cotyledon, or seed leaves, emerge from within the shell as they push upward in search of light.

Seeds are prompted to germinate by:
Water
Temperature
Air (oxygen)

Water
soaking seeds in water allows poisture to penetrate the protective seeds shell within minutes. Once inside, moisture continues to wick in to activate the dormant hormones. In a few days, hormones activate and send enough hormone signals to produce a radicle. The radicle emerges upward to bring a new plant into the world. Once a seed is moist, it must receive a constant flow of moisture to carry nutrients, hormones, and water so that it can carry on life processes. Fi germinated seeds are allowed to suffer moisture stress now seedling growth will be stunted.
Temperature
Cannabis seeds grow best at 78*F (25*C) Low temperatures delay germination. High temperatures upset seed chemistry causing poor germination. Seeds germinate best under native condidtions where they were grown. Once germinated, move seedlings to a slightly cooler growing area, and increase light levels. Avoid high temperatures and low light levels, which cause lankly growth.
Air
... I'll finish up later. some of this is redundant from your post