I know one person from Discord was leveling Fire Flames of Ignaffar Paladin and another one was making a leveling guide for it. You could ask for tips there. That would be the most resembling the OP and devotion of this Retal FoI is fine for that.
As far already existing guides are concerned, you could use these ones:
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[1.1.4.2-1.1.8.1] Shieldbreaker from A to Z, including end game, budget build+leveling guide
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[1.1.7.2] Beginner's Scorching Ray Templar (uses Fire ray from component at the beginning)
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[1.1.8.1] Fire Shield Throw Paladin from scratch - build journal and guide
Here are some posts about leveling with Fire Guardians: