I am also novice but I have done some research on this subject and I came to the conclusion that: There is no definitive answer. There is not a way to say "That strain need x amount of water week 1, then x amount week 2" and so on, or "In that stage, it needs x amount daily". Instead, think of your plant as a unique plant, because it kind of is. It will use different amount of water depending on a variety of factors, such as amount of light, oxygen, what stage it is in, how big it is and so on. Therefore it makes it very difficult to answer. But don't worry! Every morning (when lights turn on for your plant), give your plant some water. Judging by the size of your plant, I'd say start with 1 deciliter (3.38oz) and try to spread the water around the base of the plant, not too far from the center. After that, then do not water any more for the day. The NEXT day (~24 hours afterward watering), then do not water. Instead, put your finger in the soil in the area that the water hit yesterday and dig into the soil around 1-1.5cm (~0.5 inches). Does the soil feel moist? If so, then YOUR plant does not need any more water. :-)!
I am currently using this method for both of my plants and it works very well. I know that it works well because my plants are experiencing very good growth (my best so far even though I'm growing a strain I have experience with).
Also for reference, here is my watering schedule written from memory, when my plants were as young as yours:
Day 1: 1 deciliter
Day 2: 0-0.5 deciliter
Day 3: 0-0.5 deciliter
Day 4: 0-1 deciliter
Day 5: 0-0.5 deciliter
Day 6: 0-0.5 deciliter
Day 7: 0-1 deciliter
The point of watering very little is of course to not over water. There is a saying when it comes to feeding your plants and it goes like this: Your plant will survive being without water for a while, but it will NOT survive an overdose. The overdose part has more to do with nutrients and not water, but in my opinion the same principle apply. You do not want to drown your plant. Good luck
@chupgrower and I am sure you will learn how to water your plant properly in just a few days or a few weeks! It took me a few months to finally get it but that is because I was googling for answers and looking for a set amount of water. As I have explained though there isn't really a universal amount of water that will work for every plant. Just know this that you WILL do fine, but try to always feed your plant too little rather than too much.
GOOD LUCK! Will follow your diary closely. <3