It is quite easy to transfer your files to the new Mac.
When you start up your new Mac for the first time, it will guide you through the steps of setting up the operating system, and one of the steps will ask you to restore files from another PC, Mac or external drive.
At this point, you can install Windows Migration Assistant on your old PC, choose the option to transfer files from another PC on the Mac and follow the on-screen steps. It will let you choose what you want to transfer, so make sure you transfer the folder with your photographs (normally, Pictures).
After setting up your computer, you will have a lot to learn because it is a completely new operating system. Apple prepared some articles for new users that you may want to read in order to use your computer > http://www.apple.com/support/macbasics/ Also, if you live near an Apple Retail Store, there are workshops there to help you use your Mac