Help on my lowryders + pics

Sup everyone,

I need some help on these 2 plants please The 1st plant is a little devil pure lowryder, I started her in a pc case but then decided to buy a 400hps kit. I have never given her nutes because I am a newbie and dont understand what kind of nutes mj plants need (but today I went and bought a product which has 10-5-5 n-g-k) so I will be trying this stuff when I water tomorrow.... She is about 37 days old. Please let me know how she looks and how much longer she has to go?

My 2nd plant is a white dwarf only about 10 days old but the leaves are yellowish as you can see in the pic....whats happening?

Sorry for all the questions but I am still learning

you still have atleast 3-6 weeks to go man but that plant looks very healthy on the nutes the nuts that you bought are for more the young one when as it gets a little older you need to get something on the flowering plant strong in phos... but that will do for now to get it use to it as you dont want to over feed and burn start it off with a 1/4 less than what the mixture calls for on the box and work your way up good luck must be a 12/12 plant form start to finish nicely grown i personaly think that the older plant looks like it could use some small amounts of nitrogen as the leafs are a shallow green so those nutes you bought will defentily help you out

Hey thanks for the help so can I already give the young one 1/4 strength?

no dont give the young one anything yet let it veg a few weeks to early still wait till you put it in the final grow pot then give it a very light dose what you transplanted it