thats not a universal advise.
i prefer level them to 1-3 only then go for magic kingdoms. it all depends do you pvp a lot at that moment or do you collect a lot of tributes daily, if u dont pvp at that stage u go for tributes but otherwise hitting magic earlier is much better (they should know there are 2 ways of dealing with kingdom leveling depending on their game style)
also include: unlock all kingdoms first
also my point of wiev for early game glory usage:
- save for only troops/arcane traitstones that you will want to use
honestly i remmember my first few weeks of playing i could not afford every glory bundle to even buy once (i couldnt even get 500 glory/week). might afford buying one bundle per week in totall but that meant for over a month i couldbnt get any arcanes of what id ever want and that is/was horrible. early ppl need to trait SOMETHING (meaning some decent unit that will drive their pvp team) possibly soon if not as soon as possible and telling them to just collect troops for later kingdom power is not so helpful, honestly they gonna go for kingdom power after they pull half of those from random chests anyway, while they should/.could go for pvp much earlier (probably all of you will agree that they should focus leveling their main team as a priority not randomly leveling all new troops simultaneously for more kingdom power, so as kingdom power is lower priority - prioritising extra troops for kingdom power-potential is out of place) plus you are forgetting that now new guild system brings few event keys every week so they can get that collection with minimal effort without spending precious glory.
that is for very early when they are not sure what to do with glory, i assume after they got like ~1k glory per week they will soon learn to be smart enough to know better how to spend it. but this is for those ppl who just started..