I'm a believer in absorbing the old lessons first, so yes, unless you already know "all about" the old lines and how they were played, you would do well to study Morphy and Steinitz for awhile.
Some like to start themselves with the most modern theory, but I think that's silly,
Im trying to learn the opening 1...e5 against 1.e4. Can i still elarn form the games of Morphy and Steinitz the open games players but really from far back history? Are they too out of date to out of date to learn from? Did they try hard for an opening advantage? What should i keep in mind when studying their games?