Do they have the cattle walk on mindays

Yes

If you go down to the area that the train runs and grab a place on the curb you can walk to the other end of the building (by the record store) to see a "gun fight"

Yes. Yes. 2 times

Twice daily. https://www.fortworthstockyards.org/events/fort-worth-herd-twice-daily-cattle-drive-29

Yes they do