Prepping for warrant

Hey army peeps,

Still in AIT, gonna learn my MOS to the fullest, but still want to make sure I can cross out all the requirements as I move along and not try to tackle them all when I decide to apply.

I’m an E4, how long do I have to wait to apply to warrant (non pilot)?

My recruiter said I didn’t have to wait but I saw online that many positions require 2 years at least.

Anyone on the inside that can help walk me through the requirements or give some tips I can start completing now, I.e.: courses needed or whatever? Gracias!