Where should I start if I want to collect the ATLA comics?

Hey guys! My friend recently got me into ATLA, and even though I’m not usually a collector, I really want to start collecting the comics.

The thing is I’m not sure where to begin. I’ve seen different editions, omnibuses, trilogies, and probably a reading order I should follow, but it’s all a tad bit confusing from the outside.

For someone who wants to collect and read the ATLA comics physically, what would you recommend starting with? Should I go by release order, chronological order, or focus on specific editions first?

Side note: I would prefer no piracy or anything too sketchy.

Thanks in advance!