Use molasses as part of a brew for your plants. Use along with worm castings, seaweed extract and when flowering starts add with some bat shit! ... all cheap organic nutrients, tried and tested throoughout the ages.
Depends on the part of the universe in which you reside.
For me its my local seedbank/shop. If your country doesnt allow seeds then it might be an online shop like attitude seedbank or rhino seeds
Looks good to me ... How does it smell or smoke?
Naturally as the green chlorophyll fades you would expect the other pigments present in the bud to show through. This is very dependent on the strain though as weve all smoked bud that is bright green when dry. To make doubley sure its not bud...
This is coool... or it will be when you lock it down.
A few points though.
1. Your 1kw MH is way too much for those little seedlings at this stage.
2. Your plants look very wet. Is this because you watered them just before taking the picture OR is this because you have no ventilation in that...
You will NOT be able to use a timer alone with a regular HPS/MH setup. You will need ann additional piece of equipment called a 'contactor'. Without a contactor you will just ruin any timers plugged into your setup. This is not needed if youre using a digital ballast setup.