I'm having trouble swallowing the claim that you "bought" Final Cut if you're getting that error. Unless you "bought" an "old version" of Final Cut Studio (or FCP), which is to say, anything before 5.1. Older versions such as 4.5 or 5.0 will NOT WORK, since they were not built for Intel Macs. The "no AGP graphics" error in particular sounds like you're trying to run version 4.5 (which looked for an AGP card, since at the time there was no PCIe in any Mac).
FCS 5.1 will work just fine with a MacBook.