The LOTR locations mentioned in The Silmarillion would be in the same places as the Third Age inhabitants knew them. If one could pan to the east on the map shown in The Silmarillion, one should easily be able to correlate the locations of the places you name with their appearance on the LOTR maps, using the Ered Luin as a reference point.
I lack any of the books at the moment, but I believe Cuivienen was already vanished by the time of the War of Wrath.
Also, welcome back!
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