Uploading Pictures to an iPhone?

Can someone please explain to me exactly how to upload photos from a folder in iPhoto on a MacBook Pro to an iPhone 4? And I mean step-by-step instructions because this technology is very new to me… All the info I've been able to find gives condensed half-answers and is useless.

1. Plug in your iPhone
2. Open iTunes
3. Look down the side bar for your phone and click on it
4. Near the top of the window, click on Photos
5. Select the photos you want on your phone
6. Click on Sync near the bottom of the window
Done!

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