Firstly,
There's tons and tons and tons of information on the lighting question you asked and on a lot of the questions you will encounter. I highly encourage you to spend your spare time reading others grow journals and the "HELP!" sections on grow forums. It's where I learned a majority of my grow information.
Now, with that aside, you're not going to want to switch to 12/12 for a good while, for me it was a good 2 months (I was doing a SCROG set-up). It is DEFINITELY not worth flowering on your 3rd set of leaves. General rule of thumb is 1/3 of the space your have then switch to flowering.
There's an organics section on the forum that can help you out with organic nutrients/compost. I don't know much about it, but I DO know you're going to want a wayyyy better soil.
As far as the application of molasses goes, my only knowledge on the usage of that is when a DWC grow is close to harvest time.
One of the newer errors to growing is OVERWATERING. Be careful! When I grew I was using a DWC set up, so I haven't really encountered much on the end of watering soil. But I can tell you many a friend of mine on forums who starts growing has over-watered a plant once or twice.
Keep your plants in separate containers. Once their roots tangle up it is a bitch to fix.
Lastly- PATIENCE DEAR FRIEND. It's very easy to get excited at all the prospects of your bud porn, but waiting the extra week or two can really really help out your grow.
Edit- We need a lot more information to help you out.
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Things you're going to want to post in order to get useful info.
Grow Box Specs- How Tall/Wide is your set up? This will help you figure out what method of growing you should undertake. (LST, SCROG, Topping, Nothing)
Seeds- Are these seeds from a random batch you were smoking? (Bagseed) Or have you ordered them from somewhere? Are they Autoflowering? What's the Photoperiod? If the answer is bagseed you're probably going to just have to "feel it out."
Lighting Conditions- What type of lighting are you using. From your picture it looks like either T5 bulbs or Tube CFLs (are those t5s? idk). Not a bad Idea, but you might want some lights directly overhead. What type of light is being emitted from these bulbs? Your ladies are very particular about the spectrum of light that you give them. Make sure that they are the correct color and have a decent lumen output.
Reflective Material- Are you being efficient with your light? A good grower will make sure that his babies get as much of the light as possible reflected back onto his plants. Make sure you have flat white walls or some sort of reflective material like mylar. NO ALUMINUM FOIL: it creates hotspots and those are NEVER a good thing.
Room Temps- What are your room temps like? Are you monitoring them closely? Make sure that your grow is around 74-80 Degrees F. You also want to have good airflow to make sure you dont create hotspots.
Nutrients/Soil PH: Make sure you have good food for your babies! Let us know what your using. Soil PH: Make sure you get some sort of device that will help monitor your soil's PH level. Always make sure to include those in your reports. If your PH levels are out of whack, they may lead to a nutrient deficiency problem.
