First grow, white widow auto, Growlab 80, HELP

Thank you to those that brings this forum to us beginners, I for one need it. I received my wwaf and planted 3 seeds in soil pellets 1 day ago. Using 2 GE Daylight F15 6500 color temp lights about 3" from soil.
I’ve ordered Growlab 80 tent and have 2 6" 260 cfm inline fans.
Once seeds sprout how long should I leave under f15 lights?
Have access to MH or HPS (5000k grow and veg state, then 2700k for flowering )
looking at King Plus 600w Double Chips LED Grow Light Full Specturm for Greenhouse and Indoor Plant Flowering Growing (10w Leds)
With two 6" fans would it matter?
I’ll save my other questions for another day.
I’m not wanting to grow massive yields and don’t sell to anyone. I have Multiple Sclerosis and have to deal with Veterans Administration narcotics agreement, so 2 1/2 months life is good, 1 1/2 months I’m removing toxins to pass a drug test. I only need to grow enough to last 2 1/2 month. With grow tent I can grow year round. Any suggestions would be great.