You can run them 24 hours at this point but alot of people myself included run them 18 on, 6 off so there is ample root development. (anyone feel free to step in if I'm mistaken)

Most nutrients are liquid and are mixed in a ration to the water being given, such as one tablespoon per gallon and so forth. That part depends upon the nutrient given and what kind it is.

I've been vegging my plants for one month and then flowering for about two depending upon the strain.

I'm by no means even close to an expert but only sharing what I've learned here and in twenty something years of toking. The people here know their stuff, try searching through all the stickies for the info, you'll be amazed.