Say I have a domain that's aged and has a quality keyword - to build it out, what would the actual CPC be usually? If the baseline on google says example $35 how much realistically would I be looking at on adsense?
The best way to find out is to try it. Information changes more often than crypto prices. It's also a violation of Google Adsense policy for anyone to tell you
https://www.google.com/adsense/tc/TermsAndConditions_IRL_AUD_English-Law_Locale-en_AU.html "
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What about with the hot keywords such as attorney, loans, credit etc?
It depends on your region, your customer demographics, your web site content, the amount of quality leads you refer to advertisers, and many other things. Again, the best way to find out is to try it. No better way to find out. Read this page for monetisation tips
https://www.google.com/adsense/start/resources/monetization-tips-to-optimize-google-adsense/.