Are you prepared to spend some time learning about Relational Databases and how FileMaker works?
There are books and tutorials available on the subject. Without them, this will be steep hill for you to climb. We'll be glad to answer questions here, but that's no substitute for spending time getting a basic knowledge of how to do things with FileMaker.
There is a Contact Manager Starter solution that comes with FileMaker you can evaluate.
Given your inexperience, you may find that an off the shelf Contact Resource Manager created in FileMaker or other software will be a better option.