welcome to thr.
holsters, you can't go wrong with
blade tech iwb or owb
raven concealment IWB
milt sparks IWB
cross breed IWB
comp tac mtac IWB
take your pick they are all good to go.
as far as aftermarket sights, yes the xs 24/7 big dot night sights are imho the best sights on the market for defensive use.
between meprolight and trijicon, i prefer trijicon, as far as a laser i have no need or desire to have a laser on a handgun, other than for the use during dry for practice, and that will never be a crimson trace it will be on a removable light/ laser combo like an m6.