@Alien_Shore, are you going to be using a grow tent, a closet, or a more open space?
One of the best pieces of advice I could give you is the more flexibility you give yourself with the set up the better. The environmental requirements change a lot from the seedling stage to the end of the grow, and seasonal changes and outdoor conditions can play a big role as well. You can find yourself having a difficult time keeping the humidity in your grow space high enough while your plants are very young, and then a month later it can seem almost impossible to keep the humidity low enough for your plants to be safe from pathogens. Of course everyone’s set up and conditions vary quite a bit. I struggled mightily with humidity for a long time, but I have 3 grow spaces stuffed into one fairly small bedroom, so that’s why I generate so much humidity.
My biggest grow space is a 4 x 6 closet grow, then I have a 2 1/2 x 5 tent, and a 2 x 4 tent. The closet is in the corner of my spare bedroom, so it has 2 outside walls. This makes keeping the conditions in my grows difficult sometimes. The outdoor temperature has no effect on my tents at all, they’re only influenced by my indoor conditions. The closet is a different story with it’s 2 outside walls. They’re insulated, but there’s still a pretty heavy influence, both in the winter and summer. In the winter I need heat in the closet grow, but I rarely need to add heat in the tents. In the summer, I need to run AC specifically because the sun is beating down on the walls outside the closet. If I had it all to do over again I’d demo the closet and put a 4 x 6 tent in it’s place.
How many plants do you want to grow at a time? Have you chosen a grow light yet, or what kind of exhaust fan you’re going to need?
I have my closet grow set up in a way that I can have the exhaust recirculate into the grow room, or I can direct it through a vent I put in the wall to my living room. It helps a lot to have that option. Also, my 2 1/2 x 5 can recirculate, or I can vent it up into my attic and out the ridge vent. This way I can take advantage of lower or higher outside temps in an effort to save electricity. Now it’s starting to get cooler at night where I live, so setting the 2 1/2 x 5 to vent out the attic draws cooler outside air back in, and takes away the need for air conditioning to cool the grow room. A lot of times I switch things around pretty frequently. Right now the big tent is recirculating because it’s pouring here and I wouldn’t want to be drawing in 100% humidity air from the outside, especially during lights off time when it’s already a big effort to keep humidity in check. Tonight, when all the grow lights are on, and the temps in the grow room are climbing, if the rain stops I’ll vent it out again.
Anyway, if you’re only going to do a small grow you won’t have nearly the troubles I’ve had keeping up with conditions, but it’s been my experience that Rush fans and saltwater fish people usually don’t do things small, lol.
Your grow light will be the most important purchase you make. Without a good one, most everything else you do could end up being in vain. My personal preference for lights is HLG, but there are several good choices these days. Just avoid Amazon fixtures for the most part, the companies there all lie about the lights power.