Found way old first print books?

25 years ago my husband's gma died. His parents put her books in the attic and we bought their house.

4.5 years later, we found the books and looked them up.

We had first editions of
A tree grows in brooklyn
Dr Zhivago
Appointment in Samara
The road to birmingham

and hundreds of other books.

Some are selling for $100's and some for $1,000's

Most books are from the 30's to the 60's, most are recommended reading from readers digest.

How do I research, list and sell these books accurately?
 
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