In an ideal world, players shouldn't have to consciously think about any of this
Put all nonland cards chosen this way onto the battlefield, then put all land cards chosen this way onto the battlefield tapped, then put the rest on the bottom of your library in a random order
Lets take a look at where each planeswalker general currently sits on EDHrec: Daretti, Scrap Savant (1418) #2 in Red Lord Windgrace (873) #3 in Jund Teferi, Temporal Archmage (753) #4 in Blue Freyalise, Llanowars Fury (677) #5 in Green Liliana, Heretical Healer (670) #6 in Black Aminatou, the Fateshifter (650) #6 in Esper Nahiri, The Lithomancer (558) #5 in White Estrid, the Masked (502) #7 in Bant Nicol Bolas, the Ravager (442) #11 in Grixis Nissa, Vastwood Seer (441) #8 in Green Jace, Vryns Prodigy (438) #9 in Blue Saheeli, the Gifted (386) #12 in Izzet Chandra, Fire of Kaladesh (364) #12 in Red Ob Nixilis of the Black Oath (270) #17 in Black Kytheon, Hero of Akros (209) #15 in White Planeswalkers being generals have been a fairly popular, with a majority of the legal generals being in the top ten of their respective color identities
He calmed down later on, and when he returned in the story, it was the same block in which Elspeth was the central character, so it was natural that he take on another color
Beyond that, it largely comes down to things like budget and whether or not you've already got the cards
