first timmer ,,, Northern Lights and Bubblelicious Autoflowering in bubbler

when would i start feeding them nutes for first time and the best kind of nutes for bubblepho system,,heard a lot of diffrent things any help thanks

I'm growing northern light as well, I started feeding her on the 3rd week with General Organics BioThrive.
Check her out: https://www.rollitup.org/auto-flowering-strains/633931-first-time-autos-auto-northern.html