I believe that you are going to use Workbench and Mechanical, and thus you can find plenty of tutorails on Youtube.But I advise you to have a look into this AIC:
There will be a step by step methodology and some application examples. The most difficult part is to make sure, you don't miss a property for your further analysis.
A good starting point is to have a look into reference materials database provided by Ansys Granta. if you have an access. See here for more details:
https://www.ansys.com/products/materials (EduPack for education, Selector and MI for research)
You'll find as well other discussions on the forum about this topic: https://forum.ansys.com/forums/topic/adding-material-library/
And finally you can create your own composite materials with estimated properties using analytical tool (Synthesizer of Granta EduPack) or numerical tool (Material Designer), here for more details: