Hey don't take this the wrong way but you're asking elementary questions and essentially said you're like "huh?" when it comes to reading up on this stuff. It's very likely most people are reading your posts and thinking this noob is going to learn the hard way.
It's easy to get a seed started, everything that comes next, well it doesn't get easier. You will greatly reduce your chance of failure by taking a few hours to school yourself. Doubtful you'll receive answers to the multitude of questions otherwise. It's work, no way around it.
I recommend the sticky in this forum "how to grow marijuana," or the beginners guide at
www.groweedeasy.com
Watering, pH, nutrients, light, it's all covered. good luck man, may you have your own buds soon..