No not my first but only a few under my belt I like the way Your room sounds,i can picture it..however if it's under ground it shouldn't b to hard to figure out once I get food on ground will probably take care of temo issue as the ground is like stable 50s temp range install wall fan into...
Your temps fine more airflow the better worry more about light leaks and as long as I keep it around 80 daytime your fine or get your lights on at night when it's cooler I found that to help a lot I also run 20 hrs of light night temps are very flexible mine drops into low 60s never had a problem
Holy shit your all set I got a 10×10 &5×5 Mylar tents pretty basic set up 600 & 400 watt mh_hps set up with occilating fan online exaust that keeps me at 77 degrees stable
Hey a bag of black gold soul it's light airy add about half a bag of fermeculite and half bag of clay pellets moisten and you got an easy bad add mix no nuets will b needed for first 3 weeks just PhD water and you'll get frosty treats like this every time week five flower gorilla glue #4
I think your doing ok for your second grow keep doing whatever you have been doing people are suppose to b here to give advice and help not criticize i like your scrog as well I grow 95% if my beans on r.o water very very little nuets if any and I get top shelf icy plants every harvest good luck...