Guitar teacher here.

-Playing righty is fine

-Remember to use the tips of your fingers most of the time

-Think about your overall posture

-Think very carefully about where your thumb is located and how much your wrist is bent

-Probably start with a method book learning to read sheet music (Mel Bay, Alfred, Hal Leonard, etc.)

-Don't start with chords. It seems to be a thing for players to try to start with them right away but they can be very technically difficult for beginners.

Most importantly, take your time and relax! You need to avoid unnecessary tension and developing bad habits which can be even more work to undo or worse, cause injury.

Happy plucking, and good luck!

Edit: sp