Creating a portfolio section

Hi.
I’m in the process of building our new company site. I’ve created a blog theme but I need to also create a home portfolio section which will have a grid of thumbnails (with caption below each) with each thumbnail linking to a portfolio project page displaying multiple images of the project. I know this is a fairly common set-up for designers so could someone please point me to the best place to learn how to create the portfolio section (tutorial)? Thanks!