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Does a thousand sons army have access to forgeworld units such as a fire raptor or quad mortars?

Also where do I find the accurate datasheets for forgeworld models such as my brass scorpion?

Thanks for any help, little confusing with all of the books nowadays

Fire Raptors, yes.
Quad mortars, no.

The rules & datasheets you need for Chaos FW stuff is found in the book Imperial Armour Index: Forces of Chaos. You can purchase it from the FW site.

You need Imperial Armour - Index: Forces of Chaos from Forge World and the FAQ

https://whc-cdn.games-workshop.com/wp-content/uploads/2018/04/imperial_armour_index_forces_of_chaos.pdf