Good advise from widairyfarms. I am planning on adding a little, but sometimes when I get going, my posts get long. We are going to need way more information from you however. Since you have an idea in your mind, could you lay it out for us? Size (length, width, height), location, what you are making it from, access to ventilation and electrical source (make sure that you have adequate amperage to handle the lights and fans that you need in your space. Another huge consideration is your budget. Realize that to do this right, it is not a cheap endeavor. You are going to get out of this what you put into it. So, in addition to the above info, could you let us know what your budget is?
I would like to encourage you to buy seeds from a reputable dealer and not start with bagseed. There are many reasons, but the main ones are that most of the bagseed is from hermaphrodite plants and so your plants will tend to hermy and with purchased seeds you know what you are getting, the characteristics of the strain, the type of high it gives, how long it takes to flower, and what to expect from the plant structure. For example you do not want a tall rangy long flowering sativa. I am not a fan of fem seeds, but since you are planning on a small grow, you should look into them so you can start less plants.
DO NOT USE CFLS. I know that I am shouting, but CFLs are lacking in so many areas when used to grow. It all gets down to lumens and kelvins like widairy said. CFLs put out the least amount of light for the electricity used, when you get enough of them they run hotter than HPS, and they produce substantially less bud. Tell us how large your grow box is going to be and we can tell you how many watts or bulbs you will have to run to be adequately lit. We will give you watts and lumens of different lighting sources that you can use in your space. Your yield is directly related to your lighting. Since you have probably been watching You Tube videos, I am going to caution you to take everything you see there with a grain of salt. Some of them are outright fraud and meant only to sell products.
Ventilation is almost as important as your lighting. What are your ventilation plans?
I do not have Roots organic soil available to me, so am not really familiar with it. However, I used Roots nutrients and didn't like them very well....and I was just using them to supplement my supersoil. I have gone to the GO line of nutrients for my organic grows: [ame]http://www.amazon.com/General-Hydroponics-Box-Starter-Kit/dp/B004PS4B08/ref=sr_1_1?s=lawn-garden&ie=UTF8&qid=1413215968&sr=1-1&keywords=general+organics[/ame]. This box has lasted me since spring and I have about 8-10 plants flowering and about the same in vegging all the time, and I am still have not run out of anything yet. In addition, I have loaned the box to a friend of mine several times to make a 5 gal batch of nutrients up.
Predicting yield is an impossible job. It depends on everything--not only how your grow space is set up and dialed in, but every step of the way there are a myriad of things that can affect yield. Your first few grows you should not be concerned with yield at all. Concentrate with getting your grow space set up right and dialed in. Watch your plants and learn what they like and don't like (keep a detailed journal about feeding schedules and the like). If you learn all you can and apply it, yield will come.