Fortunately, there have been a ton of books in recent years about Reagan and his presidency. I'd recommend WHEN CHARACTER WAS KING by Peggy Noonan, and RONALD REAGAN -- HOW AN ORDINARY MAN BECAME AN EXTRAORDINARY LEADER by Dinesh D'Souza. Those would be good places to start learning of the great man.
Both good books.
I've heard of the one by Peggy Noonan but not the other.