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So I started playing 40K with 8th ed with Chaos Demons. Now at my store, some people are wanting to get into Sigmar, which is great cause my army converts over, but when I look into the Khorne and Tzeentch battletombs, I don't see any info on Demon Princes, do they not get used with demons in AoS and which book can I find them in?

The grand alliance chaos book has them, but you are better off getting to Age of Sigmar app to download warscrolls (the AoS equivalent of dataslates). Unlike in 40k the warscrolls are free and can be found along with the relevant miniature in the GW webstore.

Allegiance is done by keyword, so if it has the 'Khorne' keyword it is good to go for a Blades of Khorne army, ditto for Tzeentch, Nurgle, etc. Units like the daemon prince aren't listed in mono-god sections because they can potentially have any of the keywords (or none at all). So stuff from the Slaves to Darkness faction can be taken in mono-god armies as well.