Which - Mac model - RAM? - CPU? - Ghz?
Or things to do with the Mac?
Now that I have one I'm not sure where to start. Thanks!
What are you going to use it for? Such a wide range of apps, but depends on your needs.
I think that jeremysteel was correct. It has been months since you asked but your query only collected a few responses. These Macrumors forums are full of opinions. If you asked a more specific question you would have drowned in answers by now.
Are you interested in music, video production, photography, or using your computer with your home entertainment system? Do you want to share files or hard drives between Windows machines and your Mac? Do you want to run Windows or Microsoft Office on your Mac?
Many of these tools are free or shareware. Some of the best ones come free with every new Mac. Although all will run on a 4 Gb OS X machine, some like Google Earth, perform better with more resources.
iMovie - Easy learning curve / Videos can be formatted for specific devices or platforms.
Seashore - Powerful yet simple video editor / layers / effects
iDVD - Because it still works great
Serious Photography Tools (Lightroom, Photoshop, Digital Photo Professional)
Audacity - Great sound editor
iTunes - Works with iPhones, iPads, iMovie, and iDVD
Google Earth - Because you can
Handbrake - Video tasks often require video conversion / This is the go-to video transcoder
Paragon NTFS for Mac® 12 - To read AND WRITE Windows NTFS volumes with ease
Time Machine - Because you should