Is it possible to have client log-ins????

im a web designer and im looking set up pages where only clients can log in to see their work

is it possible for me have a login section on my homepage where clients can log in but only have access to a single page of which they can see some graphics associated to their company

Yes. See Security -> Web Permissions for creating web user groups and document groups to associate with them, and Web Users to create the web (front-end) users.

Create a web user group, create a document group, and connect them in the three tabs on the Web Permissions page. Create users and assign them to the web user group. Assign the private documents to the document group associated with the web user group. Now only users logged in as members of that web user group will see the links to the pages (if your menu is built with Wayfinder) or be able to access the pages directly.