Starting My First Grow

Hey Guys/Gals I'm new to this forum.

I'll be Starting my first indoor grow in the next couple of days and have a few question so i can start my grow with my head clear and not be all confused..

This is my current set up that i have so far..
Viparspectra 900W LED Grow Light
4x4 Hydroponics Grow Room Tent (hopefully to grow 4 plants for the start)
have got some premium soils from my local bunnings.. Will have about 70% soils, 20% coco and 10%per-lite

my question is will i need a fan or a ventilation system for my setup as when i bought my viparspectra led light, on the ad it said i didn't need a fan as it has a self cooling system for it.. But I'm guessing it would still warm up the area if i was to leave it on for 18+hr of the day.. as I'm trying to keep my ph level for vege stage in the high 70's and once i reach the flower stage after about 5-6 weeks depending how big my girls get I will try keep the temperature in the low 70's which then i could put/bring in a computer fan or something to bring the tent/area to my desired temperature in the vege stage..

feel free to add/recommend me anything as i want to go in to first grow strong and healthy.. (obvisiouly ill be making some mistake as this is my first grow and will definitely learn from it and improve my self in my next grow)

If you are concerned with smells you might think of some form of ventilation. You will need to exgange air in your tent as well

4 plants in a 4x4 space is tight. You'll want to do a pretty short veg to keep them under control. And @GeneBanker is definitely right. I'm using my tent for veg right now and I'm only running my led's at ~48watts each, if I didn't have ventilation the temp and humidity would spike and the co2 levels would be depleted in no time.

Here's a good article
https://www.htgsupply.com/informationcenter/resources/understanding-ventilation

Thanks for the info I'll definitely look into a ventilation system and put a hold on my seed until I get some kind ventilation system setup.. I'm not in any rush to start growing as I'd like my first grow to be a successful one and will definitely be keeping a journal of my grow so i know for next time if i should add something or readjusting things so it could be better then the last.

You will also want air movement inside the cab maybe a medium oscillating fan they have decent ipower 4" in lines with a carbon scrubber for around 85$ also keep in mind that "900 watt" led probably runs closer to 275/300 actual watts so around the equivalent of a 400 watt hps

Klozetgrow - yep i understand that 900 watt led run closer to 300ish actual watts and is equivalent to about 400 watt hps did my research still think its OK to use in a 4x4 tent? with 4 plants? as someone said earlier it might be tight. but I'm not planning to for them to grow and get cramped up in the small area..

It will grow ur plants no doubt but you would benefit from more light do a run and see what you think imo two of those lights would do well in there and a 4x4 will hold 4 plants no problem