How do I move folders and albums in iPhoto on my MacBook Pro to my ipad?

To sync photos, connect your iPad to your Mac and select it on the left-hand sidebar of your Mac's iTunes (you can enable the sidebar via option-command-S on a Mac), and on the right-hand side there should be a series of tabs, one of which should be Photos - if you select that tab you can then select which photo albums/folders to sync to the iPad. There is a bit more info on this page.

You will need to sync all the photos that you want on the iPad together in one go as only the most recent photo sync remains on the iPad - synced photos can't be deleted directly on the iPad, instead they are deleted by not including them in the next photo sync.