I highly advise you to stay away from the Miracle Grow potting soils, they can deff be rough on plants. Ive had terrible experience with it when I first started. What I would suggest is first off getting smaller cfl's. Get 3 13w bulbs. I believe that is the wattage. Its the size under what you have. You will be able to touch these bulbs with you hands and not have it be too hot. This will significantly lower your temps and increase your grow are seeing as plants can pretty much rest up against these bulbs for a small amount of time.
Next germinate seeds and get dirt that has no nutes or peat or anything in it. Then mix 25/75 perlite/dirt and place your newly germinated seeds into small containers. I'm talking 2"x2" peat pot. Hyponex is a descent soil that you can sometime get at Walmart when it's in season or if they have any let over at this time. Your best bet is going to a local gardening center to pick up these supplies. It's not odd to come in the middle of winter to get 8 bags of frozen top soil from out back. Our gardening center says its a more popular item than you'd expect in the winter.
Next once your seedlings are showing signs of good growth and are well rooted in the 2x2 peep pot its time to transplant into a new soil mixture. This is about 7-10 days. What you will need is "Espoma Flower Tone" organic nutrients, Lime, Vermiculite. Mix 40/60 50/50 perlite/soil. For every 5gal of mixture add 1 cup of Lime, 2 cups of Vermiculite, and 3 cups Organic Nutes. This is a fail safe flowering mixture. For vegging you would just use plant tone instead of flower tone.
I'd also suggest that you get Brer Rabbit Mollasses from a grocery store and mix 1 teaspoon into 1gal of warm water. The warm water really helps you mix the mollasses in since it is a thick substance. Every 3 waterings use this water mixture and you will have slightly more dense buds.
It is extremely important for your water to be at a ph level of 6-6.3 for you plant to be able to absorb all nutes. To do this go to your local pet stores and get a ph testing kit and ph down. They amount of drops that you add to just plain tap water and mol water are different. So you will need to figure out how many to add to each.
I'd highly suggest you go straight into 12/12 cycle and get those babies producing some bud. Truly I feel this is a waste of your time seeing how small of a space you have to work with. GET A BIGGER CASE. You have like no time invested in this project as far as I can tell. So do it right or wait until you can do it right is what I say. But more power to ya. I'm totally here to help in any way. I'll get some pix of my setup to you soon. W/in 2 weeks.
Theres no reason that you cant have descent bud in 3 mo if you do what I have instructed. Happy growing!