Minor Project - Character Texturing

I have been having some issues with the texturing of the character as when trying to create normal maps my laptop crashes. Also I have forgotten where to plug in the ambient occlusion node into the character texture, as well as how to create a rim light shader using aiStandardSurface. I will be coming into uni to ask Alan how to do these to get my character looking as he should when fully rendered.
I have created the base texture maps for both of the costumes my character will be wearing and applied these to the model.