Man there is a ton of information on this board....try searching for specific things....I will give a quickie answer and you can search for much more detailed explanations.
1 Start your seedlings under the fluros....that 1000 light will fry them like eggs. There is no perfect time to start them on Hps...do you have a MH?? Do you have a hortilux bulb on a HPS system?? If you have a Hortilux or a sonagro then you can use one bulb through the whole grow....some say its still better to use both....I cant say its my first true grow. And while CO2 is great....until you get the hang of growing ....the basics...then learn when and how to use the CO2...