Sorry, sounds like i am being an ass. I would recommend reading for a few months until you think you have a good grasp of what you are doing, then read for another few months and repeat the entire process again.
Besides, no one can answer your question without you giving more details about your light. If you do not know what details are relevant then read, read, read and cut and paste things that seem fundamental to your goal. If you want to learn, then you have to study. Consider this forum like a library and you will do well.
If I had to answer your question with just one vague detail I would have to say "No, you cannot use that bulb for both flower and veg". Sounds like you either have a single floro or an incandescent. Neither is worth your effort. I would start with CFL's and organic soil for your first grow.
Everything you need to know is here on the board but if it is knowledge you crave , then it is knowledge you must search. Now go peacefully young grasshopper.