Okay, from what I see your set up is okay. Don't stress about your plants dying, it took me ages to work it out. I used to grow 2 WW plants at a time, so I will give advice where I can but just be aware I am no expert.
Firstly, I disagree with begineer bloomer, stick to indoor growing. It's easier to control the conditions and your plants will grow quicker. Secondly, don't go nuts on the light, you may only be using 130W but your using the cool blue light, which will emit more "useful" light so just keep using the 130W until your babies grow a little more.
Okay so the reason your plant stretched like that is actually more likely due to you keeping your light too far from the plant. Your using a nice cool 14000K (same as I used to) keep the light about 8cm from the top of your plants BUT you must have a fan blowing the heat away, so buy a fan or a couple and point it towards the light. Fans are also great because they will put stress on the plant stem, and you will see a much thicker stem in time. Incidently, Target have these awesome little metallic fans for about $10 AUD, there very small and don't blow too hard so they are great!
Heat wise, MJ plants like pretty much ambient or a little cooler temps, so try and get a cheap thermometer and keep the temp around 18-24C (another reason not to grow outside). This may require you to grow with your door flap open, or install a sufficient exhaust system.
Nutes wise, I can't give exact amounts. My plants were beautiful and green on a tablespoon of Osmocote general nutes from Bunnings for about 4 litres of potting mix.
On potting mix, do yourself a huuuuuuge favour if you haven't already. Go to Bunnings and buy some Coco Peat, it's about $2 a block and makes up about 10L of potting material. Put the block in a bucket of water, let it seperate, then transfer to a conatiner making sure you squeeze all the water from the husk (it's coconut husks) and it will squeeze to near perfectly dry. People say you need to wash it 2-3 times but I have never had to. Mix the coco peat with a normal soil potting mix (about 25:75, soil:coco peat), use this as your plants potting mix.
Every now and then you may need to flush your soil to rid it of salt buil up from the nutes. Every month I would run 2 litres of distilled or filtered water through the plant. If you see the nute pellets getting smaller, this would be a good time to maybe add a tea spoon to top up (never over do the nutes). If your plant ever stops growing for no apparant reason (light, heat etc) it's probably root block, flushing will fix this also.
Water is very important, never use straight tap water. Either buy that nice cheap distlled water from Coles or buy a Brita water filter jug and use that.
Lastly on the light, that 130W will be good for probably another few weeks. When you can see area's of your plants that are not getting any light, use spotters, little CFL's to get into the area shaded by fan leaves. When it comes time for Budding, your 14000K light will be near useless. Switch all your light off of 24-48hours and have the plants in total darkness, then switch to as much light in the red region as you can. These will be the "warm globes" or heavy CFL's in the 2700K range. You would want for two plants at least 200W, I budded on 230W and kept the plants a little further from this light, as this light is a bit otter than than the blue light.
Other than that, your set up looks pretty cool, I always prefered simple growing without all the fancy system set ups. Happy Growing