I am new to model making and I am wishing to make my models more realistic but I’m not sure what the best thing to try next is, for reference I brush paint everything with acrylics and I plan to prime my next model (for the first time) I have also been told to apply a varnish of some description as well as use something to enunciate my panel lines,

Does anyone mind explaining what order I should do varnishes, decals and weathering paints (for panel lines) I have also heard that you shouldn’t use acrylic things for panel lines if you used acrylic paints, does this really matter? Especially if you varnish it first??