My first indoor growing

This is my first indoor grow, please reply! any advice is useful!:

Equipment:

Secret Jardin Darkroom DR150
Ecotechnics Air-cooled Diamond reflector
Venture Sunmaster MH 600W
Philips Son-T Plus 600W
LightWave Digital Ballast 600W
GHE CocoPellets (10)
BioBizz All-mix 50L
BioBizz Bio Grow 1L
BioBizz Bio Bloom 1L
BioBizz Top Max 1
BioBizz Root Juice 250ml
E2 Economyline 240m3 100mm
A small normal fan
A Humidifier (works well enough)
A radiator for heating.

Plants (all are feminised): 5 Arjan's Ultra Haze # 1, 1 Church, 1 Arjan's Strawberry Haze, 1 Lemon Skunk, 1 Hawaiian Snow.

I keep them at 27-32 degrees Cecilius. Around 6-7 (less than 6,4) PH. Air humidity: 40-65%

It's been a month today since I've started growing and I think the plants are doing great. Nothing seems to be wrong with them except that some of leaves on the bottom of the plants are withering. but thats nothing I should be worried about right? I don't really know how much I'm supposed to water, and since this is my first time growing, any tips on growing or things I should do or know please do not hesitate to write! I want this grow to be excellent!

I will post pictures!

On great White shark and one of the Arjan's Ultra Haze the leaves are some what mis-colored (maybe damaged?) if I could get some answer to why it is like that I would appreciate it! Does anyone know why the 2 small leaves towards the bottom of all my plants are just dying? is that natural? Am I doing something wrong?

If you are referring to the cotyledons then yes this is normal and you have nothing to worry about.

looks like your off to a good start. the leaves your talking about are the cotyledon or seed leaves as headshot said and it is normal. you will notice as your plants grow and form a canopy light will not reach all the lower leaves and leaves will yellow and die. this is all normal. i see what you mean about the leaves on the haze and gw and if i were you i would just keep an eye out to make sure they dont get worse. sheck the undersides of the leaves to make sure you dont have any bugs chewing on the leaves. i had a plant once look similar tothat and it was just fungus. not saying thats the case at all. just monitor it for now.
as far as the watering i would just wait for the top inch or two to dry out and then water and as you progress you will learn about your plants needs and how your media drains, etc. the main thing to remember is you can do more harm when you overwater than when you underwater. as long as your plants arent wilting and the media is not bone dry your ok. everything looks pretty good though keep us posted.