Deciding what lens to use is fairly easy. Start with what lens do you have? If you have more than one lens, then you need to understand a few things about lenses in general, then pick from what's available to get what you want from the shot. There are lots of numbers and letters associated with camera lenses: mm, f, 1.4, 22, AF, IS, VR… Knowing what all these mean will help you decide what lens to use or buy.
Editing images with the PortraitProStudio 18 plugin for photoshop is quick and easy. However, if the subject does not directly face the camera, it is a little more work to get the control points set. But once set, the plugin works well. It allows easy enhancement of the images and the results are amazing.