They indeed have a guide. The instant you zone into an area with an RoE NPC, you get the "You should go here and talk to X important person." From there you're introduced to the RoE menu, which gives you tutorials on how to do things like resting, taking on FoV, accessing the RoE menu, etc. And then as one of the basic quests, you get Trust(Nation) which tells you which NPC to go to in order to start Trust for that nation. I do not recall if it unlocks all three at the same time or it just requires you to finish the first before it gives you the other two. Either way, it introduces you to Trust in the three nations.

The only thing I'd like changed is making Ferreous permanently obtainable. Bastok doesn't have a healer Alter Ego for the initial trust, and San d'Oria's is a DRG/PLD, which has a very limited pool, so unless you start in Windy you're in a bit of a fix. Making Ferreous permanently obtainable lets players go out and do the tutorial stuff, likely earning the 500 Sparks they need in the process, and unlock Ferreous so that they have a healer (even if he doesn't pro/shell) to help keep them alive more easily.