So I've just started a game with a group and they are all starting at the base levels for Archtypes and XP. I want to introduce the special abilities from the more advanced Archtypes from the Tome of Fate, Tome of Blood and so forth. I'm thinking of having them purchased like Talents. What I would like is advice to what tier said abilities should be counted as.

That's much a case by case problem you have there. The special abilities of the advanced archetypes are vastely different in power levels. Some a flavourful but mechanically awful, while others are mechanically good.

See what they do and then determine how valuable it would be. Compare their power to talents, if that's how you're going to handle it.