Runihuna looks good to me! Warlock lord's initial background is good to start with. You don't have to go too crazy, so long as everything is consistent. You can develop character within the campaign if you wish.
Here are some character creation guidelines:
Level 20. 40 point buy, full ability score upgrades for level. Races are restricted to humans, but you can take a +2 to any one stat based upon your position in society. The characters need not be revered or have a high position in life, they were elevated by the Gods from whatever station they once had.
+strength: warrior
+dexterity: boatman
+constitution: laborer
+intelligence: scribe
+wisdom: priest
+charisma: noble
Spells
Sharing spells is not an option, these are divine gifts intended only for the particular character. Most importantly, divination magic, divination related class features, or items with equivalent effects don't work with the exceptions of Augury and Commune. If there is a particular class ability that is similar to a divination ability that you wish to pitch to me, present the mechanics and I'll consider it.
EDIT: anything PHB, from complete divine, or complete arcane is fine. Anything else, swing by me first.
Class
I'm more concerned with flavor than power. Any class that isn't specific to a given setting, reliant on psionics, reliant on technology past the bronze age, or involved in some kind of guild/group structure is fine. Guild/group structures are fine if you can adapt them to an Egyptian feel. Alignments are off, though you can describe a character in terms of alignment if you wish. Obviously, there are no alignment restrictions for class.
Weapons and Equipment
Most weapons are available, they'll all be bronze but I'm not going to change the stats for them. No double weapons, fake weapons, or race specific stuff. The short sword is now the khopesh. If a weapon sounds french or japanese, it doesn't exist in this Era. You are in a desert, so light armor only. All shields are okay.
Equipment is standard character wealth, leftover money is lost. These are divine gifts. Please detail your equipment, the odds are that I'll say yes as long as it isn't really broken or off-flavor. You may design your own specific weapons and items as long as they are tied into the power of a selected deity, don't break any of the rules for restricted powers/technology, and make a cohesive type of sense. You still pay the full appropriate wealth cost, of course.
That's about it for guidelines. So basically go nuts within the Egyptian theme.