Hi there and welcome to
RP!
You can find a bunch of tutorials and tips about skin-retouching in the tutorial section
here
To answer your question about the light glare:
It's a tricky thing to get rid of them, it depends on how far you want to go. For a good start the easy method is to press ctrl-alt-` which selects the luminosity of the picture and then paint in this selection with a soft brush at around 5% to 10% opacity over the glare with a sampled skin-tone. It gives you a pretty good result but only works to a certain point, useful for portrait-retouching. If you really want to go so far to make a glamour-picture from such a bad picture, there is nothing left but cloning some other part of the skin, placing it over the glare and carefully matching it to the face with dodge & burn. In other words you repaint the lights and shadows of this part of her face manually.
In a usual retouch you certainly do not have to clone every pore away. In fact it would make the skin look too flat! But if you face very deep pores which look too disturbing, put a blurred layer on top, mask it completely and then paint in the mask where you want to texture to reduce. The smaller your steps, or in other words how low the opacity of the brush determines how obvious the result will be and if it will look overdone at the end so take your time and be careful when doing so.
Hope I could help some?